Not to scare you at all, but I've been fired twice because of my transgender issues.
The first time, I had a really great boss (I thought) and we were close and I was moving up in the company. Whenever she'd come to our store, her and I would go out to lunch and chit chat. I was her golden boy. Then, one day, I decided to come clean to everyone about my transgender issues. When I told her, she seemed shocked, but okay about it at the time. However, no more lunches, no calls, all of my suggestions were dismissed and I was constantly rebuked for undermining her authority position (which I didn't do), and within a month and a half of telling her, I was fired for very dubious reasons.
The second time, my boss was an a-hole. He was a military vet and despised my long, pretty hair which he told me to get cut. I poured over the manual to make sure that I wasn't breaking any rules. I was effeminate then, but overtly girly. One day, he pulled me aside and said I no longer worked there. He said "I don't like working with ->-bleeped-<-s." Tennessee has an Employment at Will policy, so employers can fire any worker at any time for any reason. Also, gender identity and sexual orientation aren't protected here (though, to be fair, I'm not homosexual - I just got lumped in under the flag).
There is at least a little glimmer of hope: The job I work now is awesome. I love the company and the people. My boss is supportive of me, though I haven't told her about transition plans. I feel that if I did transition, I could and still keep my job. Only time will tell, though. I'm lucky that I'm getting into IT work because it's one of those fields where you don't necessarily have to be the face customers see.