It is based on two simple ideas:
1) God knows everything about you and sees everything you do (there is nowhere to hide so you might as well admit it)
2) God is always unconditionally loving you in spite of what you have done in secret/darkness (thank God)
The exercise is simple.
Step 1: Admit to God everything that you've been keeping a secret, everything you've been doing 'in the dark', realizing he already knows about EVERYTHING anyway. Confess! (And here I mean Holy Spirit knows)
Step 2: Surrender to His unconditional love and receive acceptance and healing.
So, simply admit to the first step and acknowledge that God is aware of EVERYTHING going on in your life, whether it is things you do in public or around people or in private or ways in which you hide things or keep secrets. He knows all of your skeletons, all of your dark secrets, all of your thoughts, all of your sins, all of the things you feel guilty and ashamed about, and every single motivation and manipulation that you have ever engaged in. And yes it includes you pooping and having sex. ie. You cannot hide from God.
So what you do, is you just review various things in your life that you think God is not aware of (because you TRIED to do them in isolation/guilt/fear/shame/darkness/ego), and you admit that God knows about it. This can be somewhat humbling, and perhaps even a little scary. God does know what you get up to in bed at night ;-) God does know the foods that you sneak when nobody's looking. God does know how you really feel about various people even when you don't tell them straight. Go over all the things you do in life that you keep secret and conceal and hide and pretend and cover up, and recognize that GOD SEES IT. Expose it to Him.
If you really allow the first idea (God knows about everything I do) to be a kind of 'tuning fork' that you keep focusing on, you may find yourself suddenly becoming aware of various things you feel GUILTY about, things you do in what you think are the most secret of ways, of which you perhaps feel ashamed. It's okay, acknowledge God knows about these things as well, and remember that He loves you anyway.
Then after you've done this for a while you'll start to get a feeling that it is pointless to hide anything. IF God knows everything about everyone you do, even all the things you've hidden, then what's the point in trying to hide them? What's the point in trying to kid yourself that God doesn't know about it? And why are you bothering to hide it at all when it doesn't work? Then you start to come to this conclusion.... I might as well NOT EVEN BOTHER trying to hide any of this from God. I might as well just ADMIT TO IT ALL. And that might feel a little bit scary too because you wonder if admitting it will condemn or judge you, but it won't.
Because now you remember the second part... God loves you unconditionally IN SPITE OF any of the things that you have just CONFESSED to, and forgives you of all of them, none of them are more important than that he loves you, and you are absolutely unconditionally loved ANYWAY even if you KEEP doing all these things.
So this is where you start to admit to love what is IN you, and expose all aspects of your inner life TO love, and then ACCEPT that love still loves you anyway. You can ask God then to heal your guilt and shame and fear and hate and other dark secrets. You can ask God to heal the need to hide these things, or even to do these things if you like. You can offer up these 'sins' to Him in an amnesty that has no repercussions, and finally SURRENDER your life to Him. Allow Him to come in and heal you of all this guilt and shame that has made you turn away from Him. ALLOW HIM TO LOVE YOU. RECEIVE THE LOVE!!
This is simply you exposing yourself to God, to the light, allowing light to shine on everything that keeps you separate from this exposure, and then allowing yourself to be LOVED more than you ever thought possible.
Confession is not the focus here, you are not admitting to actually BEING sinful/guilty/shameful, you are exposing these things to the light so that you can realize you are FORGIVEN and that nothing is being held against you, because you are NOT sinful.
Give it a try. :-) You'll feel happy and free afterwards.