I only know of several dozen of which most aren't even available options within EU. DIY has its limitations and its mostly about supply and avoiding problems with customs. Its a goddamn nightmare to deal with some times, not much fun, always eveyrthing uncertain more or less each time. Its doable to and to many the only way there is. In Finland the problem is insanely long waiting times and crappy HRT based on age old thinking.
If I were to play "by the rules" I would still be on day zero and once I could get help, it would be inefficient and just plain wrong. We're not even worst off, UK is much much worse. Its absolutely ridiculous how our life saving medical care is being gatekept like its some arcane occult secret only meant for select few. Same applies to transition in its entirety, it feels like its really only for the strongest and most privileged and nobody else. Especially if you want a graceful transition with everything there is to be done, all so called "cosmetic" stuff is pocketed here. We only get bare bones essentials and even that isn't always the best, especially HRT is crap so I see no other way than to do everything I can on my own. I've been very lucky to find the right people to help me out and within year and half I run into problem with estrogen once again unless I stock up before that or cook my own. I have a fifteen year supple of EEn waiting to be made.