The simple transition which occurs as the result of A Course in Miracles, applying forgiveness correctly, is that you transition from blaming everyone else to becoming responsible.
Auto-pilot for the ego is that everything you experience is caused by everyone and everything else outside of you. When you think about that, it's a pretty strange way to live - only ever experiencing what life throws at you, reacting to it like a passive victim.
As you begin to see that the person you were blaming is not the CAUSE of your problem, that the cause is IN you, not outside of you, and that you are completely responsible for EVERYTHING you experience, you stop seeing others as justified targets for blame.
Now you begin to see that it is not really the person being blamed that has a problem. It's the person doing the blaming.
If a person is upset, it is NOT the person they are upset with that has the problem, its the person who is upset.
If someone seems to have been hurt by someone else, it is NOT that other person's fault, it is the responsibility of the person who was hurt. You cannot BE hurt without the consent of your mind. Your mind is powerful and CREATES the *response* of hurt in your body in cooperation with the attacker, otherwise your body could not possibly show effects.
All of the attention of blame and projection and scapegoating onto others, all finger pointing, all perception of being attacked, all perception that someone or something is causing you positively or negatively, and all ideas of being changed by, affected by, caused by or upset by, anything whatsoever outside of you, has to go out the window. There perceptions are false and they are incompatible with health, happiness and sanity.
Imagine realizing that absolutely nothing outside of you has ever affected you, absolutely nobody has ever done anything to you, absolutely nobody is to blame for anything, there is absolutely no-one worthy of being judged or reacted to, and that YOU are the sole responsible agent for what you are experiencing. And if this is true, then notice how freeing this is, how safe it feels, how deeply peaceful it makes you.
If the world is NOT attacking you, if other people are NOT hurting you, if there ARE no causes outside of you, and if you cannot ever be at the effect of anything in the world... you are SOOOOO safe, so protected, so calm and reassured, and so permanently transcendent of all suffering. Yes please!