It’s quite easy without docker to get lots of it running with a dietpi install. Runs on rpi and alike, but also on any “normal” old low end pc. Just select jellyfin, arrs, … It handles it all for you, no need to learn Docker (I know people will argue about the advantages of docker, which are valid points, but ease of installation is more important to many people). The only difficulty remains the streaming outside your own LAN (because it’s risky). VPN, tailscale, … there’s options but it always keeps on feeling risky to open up outside LAN. Local setup for jellyfin can be really really easy tho, if it’s just for yourself and you mostly watch at home anyway… And in some jellyfin compatible app like Finamp and Streamyfin you can just download a few music albums, episodes or movies to your phone before you travel…
That ease of outside LAN access poses a big risk tho. Plex can and eventually probably will share, be forced to share, get hacked etc Those cloud accounts imply the possibility of very detailed reports about who’s streaming what, when, where, from which source…