I haven't worked with a voice therapist (yet), but I just decided to feminize my voice as much as I can based on what I've read, and just do it, whether I'm presenting as male or not. So far nobody has given me a weird look or asked me a hard question about it. I have a life coach with whom I speak on the phone occasionally, and she has heard my old voice, and I've been speaking to her in my female voice (she's fully aware of my condition), and she says I sound pretty good on the phone - not entirely feminine, but if she didn't know who she was speaking to, she might assume it was a woman. So I guess what I'm saying is that in my experience, you can do quite a lot with your voice and not get clocked...