For me, the key is to raise my voice box a fraction of an inch upward.
I learned to do this by speaking in the highest, squeakiest voice I could manage. I noticed where my voice box was when I did that.
If I continued raising it in exactly that way, but talked normally, everything out of my mouth, regardless of what pitch I used, sounded feminine.
I learned this from the CandiFLA youtube videos.
I hope this helps. Good luck.