At the end of the book, does Winston win victory over himself? How?
I would argue that he doesn't. Most of my feeling about this comes from the incredible depth of the hopelessness he feels and the shame he feels at having given in to the torture and given up Julia and anything else he thought was relevant at the time.
His meeting with Julia demonstrates how he has lost that burning part of himself, both of just having a physical attraction to someone and the incredible desire to fight against big brother. As he waits for the bullet that will kill him, he gives in and decides that he really does love Big Brother. This in my mind does not indicate victory over himself but rather utter defeat.