I like using Bitcoin Cash (BCH) and Litecoin (LTC) because they have low fees and are really easy to use. I've had to use Bitcoin a few times though, when the merchant doesn't accept anything else.
I use Kraken Pro to buy crypto because of its really low fees. But I also invest, so it's easy to buy bigger amounts of crypto there.
My favorite wallet is Coinomi, but I like the Bitcoin.com Wallet too.
Congrats on your HRT appointment! That's super exciting!
As for how I take my estrogen, I used to take pills sublingually for several years. But about two years ago, I switched over to DIY injections. I mostly switched methods because I've heard that injections are much more effective, and they're a lot cheaper than pills.
I'm taking estradiol undecylate subcutaneously. I only have to inject once a month, which is pretty nice. It was kinda scary teaching myself how to inject, but now that I've done it many times, it's not too bad. I just wish I would've started injections much earlier.