Sure you can dm me, I just have a terrible track record of not staying in contact with any of my friends qwq (also I'll probably be moving to Germany soon)
Buying hormones is cheap, 7,55€ per bottle/package/whatever you have. Technically, if you have medication prescribed then you get them for free, just with a general fee. There are also systems tho that you can use to get around paying that too. The expensive thing is really getting a quick doctors appointment. If you go to a private doctor for everything then you can expect a 100-250€ bill ;-;
If you have a stockpile of HRT that lasts you for 4 months then you are probably good, considering that, if you're fast, going from having no diagnosis to having estrogen in half a year. If not then you can always just DIY until you've got the prescription. Also, I think as long as you have some sort of F64 then you should be fine regardless.
For where you should move to, I would recommend a smaller city around Vienna that is easily accessible with public transport. If you wanna learn German too then going to the Graz area is a bad idea because of the accent there qwq