Most of us have considered the work problem as well. At the end of the day it's always a risk that people will make life hell and a job will go downhill because of it. I don't want to sugarcoat anything or be overly optimistic if the people there are as you suspect, but they may surprise you because if they don't dislike you as a person now, they've had a chance to meet an actual transsexual without even knowing it, and that will dawn when you tell them. Or maybe not, who can say. They will either have to learn to get along with you, or be childish, and if things are very bad you have the option to leave and try another job at least. Not what you'd like but, if it gets intolerable.
I don't have this problem at the moment as self employed but if I did I would simply continue without mentioning it if there's little chance it would be accepted and see how it goes. Or I might just leave, I don't know. I've left jobs before for less to start fresh somewhere else. I used to work in a bar but the only people I had any real rapport with there were the cleaning staff who happened to be from Eastern Europe. Those guys I got along with but I suspect they'd find the idea of transitioning bizarre and undesirable as they had an oldschool mindset about roles. But who knows. I never confronted them with the topic when I was there, I ought to give them the benefit of the doubt.
Once on T you know it's a matter of time before the voice breaks and the facial hair comes in. People haven't said much about it at all in my case. I had more comments about my voice during the first 2 weeks of T when I sounded like I had a cold, and when it passed through that stage and got deeper people didn't seem to notice or care as much as when it sounded "sore". Facial hair, though... well you can shave it for a while and stave it off a bit during the early stages. It can take some time to come in. You might have plenty of time to talk to coworkers about it if you are inclined, without there being an 'instant reveal'.
