yo!
mazzoni's cool, they do my hrt, they're down with nonbinary people, and stuff, and informed consent is sweet and so much more convenient than having to prove to some therapist that you ain't out of your head, or something.
as far as doin' the horizontal tango on hrt, i mean, i was using it just fine on, like, astronomical doses of e, right before surgery. i feel like there's definitely a psychological component to keeping stuff working down there! gotta want it to work it, i guess?
voice practice is important! i'm trying to get my singing voice back after my trach shave went south

but i'm working at it, and you gotta do it really frequently for it to be effective! if it makes you embarrassed to do it at home, my suggestion is to do it in the car, if you have one! even if you don't end up wanting to go for a different voice in public, it never hurts to be able to pull off whatever voice you like, and hey, singing's fun. even with my speaking voice, i never did any of these, like, voice training or voice therapy programs, i just kinda figured it out on my own because i just messed with my voice like hours a day for a while.
the one thing i will say about "full transition" re: being nonbinary and stuff is that it's sort of the sort of thing that feels terrifying to start, feels terrifying during, but when i actually finished up and ended up on the other side i forget the bad parts and it just seems laughable that i ever THOUGHT it would be so bad. in retrospect though memory is kinder, so like, if what's holding you back is fear, remember that if you can work up the courage to do it that you won't have to face the scary stuff (at least, not that specific scary stuff) when it's over, y'know?