God's will isn't really a matter of "whether" you do God's will or not. If God wills something, it is done. But that doesn't mean you have no freedom.
ACIM teaches that "God does not coerce" and "even God would not oppose your will". Since your will is really one with God's will, or the same as, to in any way require you to will with Him or like Him would be like Him trying to force Himself against His own will.
God is not sitting there trying to "decide for you" the question of whether or not you'll will with Him or like Him. When you ask for guidance as to whether or not to do something, with the typical "should I do this?" kind of question, you'll probably be told that "you are free", instead of yes or no. In fact I get this response so often it's somewhat annoying, because I keep asking "should I" questions.
So God isn't trying to force you into anything or to choose for you whether you will with Him. Yet He does have a will, and He also wills something "for" you.
For example "God's will for me is perfect happiness". God does will or "want" that you be happy. In truth, God creates you happy, by His Will, and in your acceptance that you are as He created you, you automatically are happy. In effect, you are doing God's will by accepting your true nature.
But that doesn't mean God is pushing you into happiness, or requiring it, or forcing it, or demanding it. He loves you, and "love does not enter where it is not welcome". "Love waits on welcome, not on time".
So there is a component to your free will, that you yourself have to freely willingly will or "want" or elect to will with and like God. To be happy, God can't just force happiness on you. Anymore than he forcefully rips you of the world and puts you back in heaven, or anymore than he stops you from trying to hurt yourself against your will.
You have to be willing to be happy. And in your willingness, which is of your own free will, and yours to decide whether or not you will do so, you either choose to will what God wills for you, or you will something else. God does will that you be happy, but your refusal is up to you.
You can ask questions of guidance which may give yes or no answers, in terms of information, learning about a situation, asking whether something might be in someone's best interest etc. You can even ask for advice such as whether to buy the computer, or whether to stay at a job etc. This is part of trust. And the advice can come across as clear and wise and true, but it is still devoid of the component of force or demand.
When you move into believing that God is demanding, you are really becoming an idol worshipper. That means you see yourself as under tyrannical rulership by God, really the false ego God that you invented, and believe that God has cruel power over you to dictate what you must do. It's like cave dwellers worshipping a God in fear of retribution that, if you don't, there will be punishment. And then the admiration of God is more like trying to love something that's forcing you to do so.
"No one comes to the atonement except willingly" and "heaven is a choice I must make" means that you still, at all times, have the freedom to choose. Similarly ACIM says of angels that "they are free to establish their kingdom wherever they see fit", in reference to them setting trying to create a Kingdom on Earth. God would "prefer" that they establish their Kingdom in Heaven but he does not force them there.
Let's be clear that God very powerfully and strongly and certainly does have a will for you, a desire, an expression or broadcast of what He "himself" wants. What he supports. What he is in favor of. What he provides and gives and sees you as deserving. And whatever He wills, is DONE. But at the same time he cannot force it down your throat. If you don't want it, he waits patiently until you do. Just as if you do not want Jesus's help, he will wait patiently until you do.
Becoming one, or sharing interests, does not entail the giving up of your freedom. It really entails the reclaiming of your freedom, and freely electing to serve God. Freely assuming the function He has offered to you. Freely wanting to create with and like Him, together, as a team. Freely accepting God's harmlessness and desire that you be happy forever. Freely allowing God to give you everything, in acknowledging that He already did share everything with you in your creation. And at no point does it entail God ever "taking over" or going into a mode of demand.
God does not demand that you accept Him. You cannot really leave Him, because of His will that you be together forever. But you are free to block awareness of His will and pretend that He does not will what He does. You can deny His will just as you can deny your own will. Which has no effect on His will. And as you enter into unwillingness to will with God you enter into unwillingness to will freely, placing your will in a state of imprisonment. And then you will your own imprisonment by a tyrannical God that is really you playing the part of prison guard.
What God wills, truly, already is. And that includes the creation of you, the defining of what you are, what you are capable of, what you really have. It also includes your true nature, your innate built-in desire or character or "what you want". In a sense you could say that God "forced" you to "naturally" want to will with and like Him. To create loving living beings joyfully. To create the beautiful and divine. But at the same time, God "forced" you to also have total unconditional freedom. It sounds like a paradox but God permanently guaranteed that you can never "escape" being free.
You are a co-creator with God, as established in your creation by the fact that God DID grant you total freedom. Because in sharing all His nature and attributes and desire with you, He established you as similarly creative, powerful, unrestrained, unlimited, and completely free. And so God did bless you with the freedom to choose "whether to" will or not. Whether to will with or like God or not. But he did not grant you the freedom to throw away that freedom in any permanent way.
You can hide from what He has willed, but what He wills cannot be opposed, or undone, or attacked. His will is insurmountable and infinite and all powerful. But so is yours. As Jesus says, "Your will is as strong as mine", and He cannot oppose it anymore than God can. In fact God is incapable of opposing your freedom, because to do so would be to revoke the fact that He willed that you BE free.
God just wants you home, wants to love you, wants you to acknowledge what you are, wants you to remember your safety and certainty, wants you to be happy, wants you to feel free and unrestrained and unlimited, wants you to be willing to will with Him and like Him, and to create with Him. But it is by invitation only, and never by force or dominance. God even gives you all of His power.
"To acknowledge that all power is of (from) God is to gain all power."
So now, if you accept it freely, you are now as powerful as God, and God cannot oppose this. You have the power of God in you. You share His power and express and extend it. This makes you all powerful. As ACIM says, "I am not afraid but all powerful."
In some ways, in terms of the causation between God and His creative act of creating what you are and what you in-built nature is, and therefore what you are "likely" to want and desire when you are being true to yourself, God DOES have total power and authority and His will HAS fully "restricted" or "defined" the rules and scope of your freedom. Your function. Your ability. What you can and cannot do. That is not open for question and your rebelling against that is the authority problem and the separation.
But in other ways, when it comes to what happens AFTER your creation, how you USE your existence, how you express your nature, what you want to choose, what you are capable of creating, that is all entirely within the scope of your freedom. That is where you have absolute authority over whether you will or whether you are unwilling, whether you want to acknowledge God or not, whether you want to admit to co-creating with Him or not.
You can't stop your function and you can't change the rules and you can't make yourself be what you're not, which thankfully provides a guarantee that even in ego and dreaming you cannot actually change what you really are, and this therefore guarantees your place in Heaven forever, you DO have the freedom to deny it and pretend otherwise, to seem to want something else, and to reject your own freedom. What God wills is permanent, but since He willed your freedom you are free to deny it, but not change it.
It is in fact your freedom, within the scope of what you are, but not freedom or power OVER God, that has guaranteed that God did not enter into the insanity of separation with you. Because your will is free to block itself, but not to undo itself, you were able to "will" (un-will) to make a dream world unlike and without God. But because you were free to do this, God was not pulled into the separation or the insanity with you. In this respect you are not "one" with Him, ie you do not cause God or overpower His will, even if you dream of doing so. You can bring an illusion of suffering into your own mind, within your own self, but you cannot bring it into God.
"Your Father created you wholly without sin, wholly without pain and wholly without suffering of any kind. 10 If you deny Him you bring sin, pain and suffering into your own mind because of the power He gave it. 11 Your mind is capable of creating worlds, but it can also deny what it creates because it is free.
You do not realize how much you have denied yourself, and how much God, in His Love, would not have it so. 2 Yet He would not interfere with you, because He would not know His Son if he were not free. 3 To interfere with you would be to attack Himself, and God is not insane. 4 When you deny Him you are insane. 5 Would you have Him share your insanity? 6 God will never cease to love His Son, and His Son will never cease to love Him. 7 That was the condition of His Son's creation, fixed forever in the Mind of God. 8 To know that is sanity. 9 To deny it is insanity. 10 God gave Himself to you in your creation, and His gifts are eternal. 11 Would you deny yourself to Him?"
You are free to imprison yourself. And untimately it IS only you that can seem imprison your own will. No one else can imprison you, not even God. And you can also set yourself free, per the secret of salvation, that you and you alone are doing this to yourself. But in order to become free, you do have to accept the "ground rules of the house of God", the nature that you have, the function He assigned to you, to serve WITH Him and accept that you are still as He created you.
It still requires you to want to accept that you can only be as God chose you to be, which the ego interprets to be a limitation, a requirement or restriction, a demand, and a lack of freedom. The ego sees it as you "having to" comply by certain rules and be a certain way in order to be in God's world. Which is true, in a sense, because the Kingdom does have conditions for entry, for acceptance, for being in it and of it. You cannot experience it without "complying" with its nature. And wanting to be of a different nature exiles you from it. You cannot hate and attack and expect to be aware of divinity.
It's the desire to be something else, something unlike God, something unhappy, something lacking freedom, something limited and less, something broken and breakable, something that God would not will, that is the ego. When you want to suffer, when you want to die, when you want to hurt, abuse and attack and murder, that is all a desire not to will like God would have you will. It's an unnatural will. It also isn't really free will, because its a way of making your will imprisoned and being unwilling. And the more unwilling you are to will with and like God, the less you acknowledge your freedom. And thereby your will SEEMS to become imprisoned, weak, diminished and hidden. Not free at all.
The ego's version of free will is really an imprisoned will which does not want to will anything. It opposes will and rebels against God. It sees itself as having a "separate will" or a will which has separated itself off from being anything like God's will, and this poses as "free will". Defiance. But it is not free will, really, it is is an illusion of freedom. It is really imprisonment, masquerading as freedom, which is why it is an illusion. And giving this up is not really a loss of anything, because the ego's version of free will is really a desire to have no freedom at all, or to have an illusion of freedom. And death is an illusion of freedom from God, who is life.
In death you attempt to assert that you have no will, no choice, no power, no desire to will anything that God wills. And this is considered "free will". It's a statement of defiance, an expression of a total unwillingness to do anything. To will anything. It's a refusal to live, because life is what God wills for you. It's a desire to not exist, because God wills that you exist. It's an expression of attack and revenge and hatred and hurt and abandonment, having done these things to yourself instead of God, knowing that God would never do these things. Death is an attempt to end your freedom and to stop God's will.
But it is in life, in resurrection, in choosing, willing, opening, trusting, having faith, uniting, sharing, loving, that you regain access to not only your own freedom and true nature, but also to God. And this flowering, blossoming, returning to how you were designed to be, does require your "little willingness". And that means a little bit willing to be like God, to acknowledge truth, to be like your true self, which is forgiving and loving and whole and healed. Which is happy and healthy and immortal. Which is joyful and peaceful and unconditionally loving.
And so you return to what you always were given, to what God willed for you already. And you open to what you have no say in, freely and gladly, knowing that it guarantees your happiness and peace and freedom. And you are restored to heaven and to the full inheritance of everything God has given you without limit. And thus your freedom leads to the restoration fo your awareness that you are the will of God and always have been. And simply by being what you really are, unlimited, you are simultaneously free. Free of coercion and demand and sacrifice and force. Free in God, because God decided you be so.
And then you resume your function, the extension of God's spirit, the joyful co-creatorship and authorship with God, and the celebration of your total freedom and unity, one with all of Creation forever.