Full disclosure, I’m pretty new to selfhosting myself, and I haven’t written a guide like this before, but hopefully this scatterbrained writeup is enough for someone out there lmao
This is just what works for me and how I set it up. Always open to ideas for improvement as well.
Yup, been porting all my music to navidrome the past few months and it’s pretty sweet. I like that there are native subsonic apps for most platforms (using tempo on android at the moment) and that navidrome also comes with its own web player to use on the fly.

Although my setup is much more simple, just using samba to get files to it and mp3tag to prepare the files if needed.
I initially used nextcloud with its music plugin (includes subsonic server) and its basically remote access + player + server in one, but its not as good imo. I’d rather use software that focuses on one thing and does it well.
I use a Navidrome server and ProjectBlue app on my Android. I haven’t figured out how to download music for offline use by using my ProjectBlue app though.