Strangely, this is easier for me to think of this, than what I will do (Something I'm trying hard not to think about so that when I finaly work up the nerve to talk to my wife about it, she will know I honestly want her to have a say in what happens). What I won't do is, pretty much what everyone else has said, really.
I won't compromise my morals. I won't try to be a different person (I'll still have the same likes and dislikes and personality, because my goal is to change my gender, not become someone different), compromise my morals, and I just can't bring myself to concider doing sex work.
That last one would make me personaly feel terrible, I think.