Have a look at sonarr, radarr, and prowlarr. Combined with a torrent client these can manage all of the searching, downloading and organising of TV and movies which should automate all your pain points.

Im not sure if this is in the trash guides mentioned already, but I wanted to leave more breadcrumbs for you and others in case they’re helpful!

I have Jellyfin running on a NUC which has mounted a few NFS shares that are hosted on my NAS, haven’t had any issues. I just added the nfs mounts to fstab and it works seamlessly.