Using the occult to give yourself a sex change. You guys are the best entertainment I could ever ask for. Godspeed.
Now this is why I teach on fringe and not some other cowardly website hahaha.
Anyway. Go watch episode or section 9 of EA Koetting's soul travel tutorial. There's some base level information to get you started.
I would suggest experimenting with body modification like stigmata or scar symbols. Remember that everything manifests downward. But really I think you guys have all the information required to make it happen. The only problem is the energy requirement and experience.
I've messed around with shapeshifting(energy shields, invisibility, aura intentions) for social reasons. Whatever you project onto your own astral body or turn it into will manifest on a "subconscious" level to other people when you do it. This is why being confident in your mind will make others react accordingly. Same thing with energy shields.
Anyway keep us all updated. To change ones gender is much more than that. It is to manipulate physical reality through energy and the mind. This has infinite possibilities so it is a very worthwhile field of practice.