If it's relatively separate living (not a roommate, but sharing an apartment/house), you might be able to pull off being stealth if that's what you want. But, yeah, in a conservative area like some of Florida, you might end up living with a transphobic person who would react badly if you accidentally outed yourself, which could happen in a million ways, so worrying about that might drive you crazy. I think both of the above repliers have good ideas. Also, you may find that searchable directories are your new best friend, because you can find out who's okay with both male and female roommates and even who's specifically LGB(T?)-friendly.
Edit: I meant you can literally search for the term "LGBT" in the listings on, say, Craigslist. Sorry that was unclear!