theres a spot at the top of your throat that you have to find, it literally feels like you're pushing the words straight from your mouth instead of coming from your chest. It sounds really weird, but it'll just click and you'll know what I mean. Something I've noticed is when I talk like a guy I kind of hold my breath, and when I talk in a feminine voice I talk while exhaling. I also never let my adams apple fall to the half way point of my throat, if It does my pitch will be too low. Beyond that I just practice, I read out loud to myself every night.