Novice...Is there a comprehensive guide for moving from Plex on unRAID?

[gaming09]

I've been using Plex for many years. I am very interested in the possibility to move to Jellyfin, but I'm finding myself intimidated by the perceived more-complicated setup.

I'm not here to dog on Jellyfin-- far from it. What I'm looking for is a guide to get me going, moving from Plex to Jellyfin with as many features intact as possible.
For someone who doesn't have a ton of experience with cobbling together systems and getting them to synergize, I need all the help I can get. :-)

This is coming from a new Jellyfin user, but it appears that to get some of the features Plex just comes with, I need to set more 3rd-Party systems or maybe just plugins. Is that true? Things like subtitles, lack of a music player like Plexamp (which I use A LOT on Android and Windows), transcoding and downloading files for playing on-the-go for my kids on long car rides.

As mentioned, I'm running Plex on unRAID docker. I already have Jellyfin installed, but I immediately saw there were some key differences in the way Jellyfin wants the naming schemes, etc. versus what Plex specifies. The way it handles the same title with multiple resolutions and versions. (I already posted another thread about that specifically.) My point being, I can see this is going to be an all-or-nothing type of move. Getting Plex and Jellyfin to coexist while I get used to Jellyfin looks to be troublesome at best. That being the case, I want to have as clear a path as possible to my goal.

Thanks!

one thing is migrating user watch data
using a script you can make this pretty easy from https://github.com/luigi311/JellyPlex-Watched basically make a .env with the plex server and token, and your jellyfin server, note any differences in library names ( like tv shows vs shows) and run the script.