As for HRT, it's great stuff. Mundane in the ways you might expect it to be weird, and weird in the ways you might expect it to be mundane. I started at 25; by which point my brain had largely blocked out or forgotten all the weirdness of changes that come along with puberty. Going into that a second time, as an adult in my mid to late 20s holding down a professional career, was wild. It came with things which included but were not limited to: Emotional changes; breast development; diminishing density/thickness of body hair; thinner, softer skin which is less oily; thinner, faster nail growth; hair regrowth/healthier hair; changes to gait resulting from changes to hips; thicker hips; curvier shape; and even weird things like subtle changes to eyesight.
There's also this fascinating interaction between perception of age and hormones, where doing a late second puberty makes you look younger? Turns out the fountain of youth is real and it's just HRT. I look younger than I did 5 years ago. It's wild looking around me at people I worked with close to a decade ago, and seeing how much older they look now, vs looking at my own selfies and seeing how at most I look the same age now.
I was a ball of anxiety about it at the time I started, but like, honestly it was the best decision I ever made. And had it gone otherwise, what was the worst that could've happened? I end up as a queer cis guy with a nice pair of tits? On the scale of genders, I'd definitely rank that above where I was at beforehand. And where I'm at now is just wonderful and far beyond what I ever dared hope for.
Out of all of the transitioning stuff, my favorite part is that, if you are visibly trans, the coolest, cutest, queerest people in any given room gravitate towards you and chat like old friends. While all the awful conservatives who otherwise enjoy sharing Opinions About Who Should Be Allowed To Exist give me the side-eye and maintain the desirable distance of Far Away From Me. Like, did you know there were pills that could do that?? It's great! Worth it all on its own honestly, even apart from things like being comfortable with my own body. (Okay, honestly that's mostly just my rad outfits doing the heavy lifting, but still)