Actually much easier than I thought.
Went the docker way and only did a few errors... Took two tries to get everything in order. I am documenting the process here https://wiki.gardiol.org/doku.php?id=services%3Alemmy but the page is far from complete...
edit: i just finished updating the page, it should contain more or less all the issues and solutions i encountered.
Thanks man! See you up there!