I had to edit your question because we can only answer one per entry.
The three stages I see of Winston's re-integration are these:
1. TORTURE: In the Ministry of Love, Winston is beaten and tortured for an indetermined amount of time. Throughout this process, sometimes he and O'Brien talk, other times it seems a regular task of the day.
2. BRAINWASHING: Up until this point, Winston hung onto his rational mind. From this point forward, Winston comes to accept every falsehood he previously knew as true. This occured in Room 101 when Winston allowed a complete turn on Julia before they tortured him more with the rat cage over his head. We see that this has come full circle when the mother he used to think fondly of he thinks he sees and could care less. We see this when he accepts that 2 + 2 = 5.
3. LOVE OF BIG BROTHER: The Party will accept nothing but total and complete allegiance. We see this at the very end when Winston fully and completely realizes his love for Big Brother.