A good friend of both Xanthos and me completed her transformation two years ago. And I have talked to her a long time about the mental aspect that goes with it. She had a lot of gf's in the past before she finally decided to undergo the operations and before the change she would never tought she would have a bf. But right after the first operation she found herself liking guys more and more (in a sexual aspect). It was (and I quote) "I could finally let go of my mask".
When she still had the male parts it just didn't make sense (don't know how else to put it). Now she is what she always was to us. A female. It just fits somehow.
She was lucky to have a supportive family and alot of friends that had already accepted the fact that he was a she before she even considered the surgery. And I think you really should have a group of people around you that support you to the fullest (besides the counceling and therapy that are offered when you consider the real change).

The best of luck to you and thank you for being so open about it!