I've been pitching my normal voice somewhat higher for weeks now (maybe a couple of months), both at work and at home, all the time when I'm in boy mode. I just basically am cutting out the chest resonance, and pitching it a little higher. Not so much as I do when I'm dressed. And so far I've only had TWO people comment on it. One at work - a woman who asked if I were fighting a cold. The other - my wife - who, in a recent difficult conversation on the topic of my situation and transition plans, said she had noticed me "speaking high", and how it was driving her NUTS. (oops) But basically, I'm practicing all the time. When I begin HRT, I expect I'll look around for vocal training at that point...