@temujin9 yes, yes, no, some pain?
you can create back ups (not automatically, unless you program it?) and lists for all your followees/block/mute/posts and import them in (and perhaps automate this?) but all your followers will have to refollow you. if your old server is still running you can point it to your new one, but it doesn't do much other than put a notice in your profile iirc.