Docker is pretty easy to use, and is easy to play with either on your own system (linux or windows) or in VM guest system. The learning curve isn’t that high and Jellyfin for example has a clear set up guide for docker on their wiki.

But radarr, sonarr etc can be installed directly within linux without docker. The Servarr wiki (that these projects use officially to share information as they’re so similar) has lots of straight forward guides for set up on Linux, Windows, Mac etc as well as Docker.

I have a Linux guest VM set up with a Radarr, Sonarr etc set up, VPN and torrent set up. It was easy to do and means its network activity is all securely contained away from my host system. The tools let me set naming rules and file preferences. The library is a shared n folder in my host system, and that is included in my Jellyfin library. So all I have to do is subscribe to something i am interested in and it will just appear in my library once downloaded. The servarr tools are extremely convenient and worth looking at if you’re adding to that 30tb library over time.