I may take some heat for this but when I see a trans woman and then she opens her mouth and out come's a man's voice, I have to ask myself, "Why doesn't she even try?"
Until transgender people are about as unusual as a skinned knee, our presentation will matter. If you're worried about being discriminated against, if you concerned about prejudice, why don't you do your best to conform to socially accepted gender norms, at least until you get your foot in the door. Then you will have a platform from which to educate.