I'm told I have a reasonable femme voice, and I haven't figured out how to raise my pitch.
For me, the thing is to annunciate all of your words, vary your pitch as you speak, and mimic the style women speak with. Boys are much more monotonous than girls, so varying your tone always sounds more feminine.
Also, get any kind of recorder and listen back to yourself, and you'll progress much faster.
ALso Also, SING! Singing is great for any kind of vocal progress! Also, it's fun! I can't sing along with most female singers, but singing along with guy singers in a femme voice is a lot of fun!
Best luck, Gennee!