Build a small Jellyfin library with films, episodes, music, subtitles, and several codecs. Test browsing and playback on the TVs, phones, and browsers people will really use. Watch server load when a client needs transcoding and check whether remote access is secure and reliable.
Metadata matching, users, and parental controls may matter more than the first successful stream. Back up the server configuration and keep the original media untouched. Compare the experience for less technical household members as well as the administrator.
Akousa