Whenever I'm on my pc again, I'll create a /n/selfhosted nostr community, analogous to reddit's r/selfhosted.
It will be a great place to discuss different selfhosting software, setups as well as asking for help.
Regarding contacts and calendars: the DAV spec is fine and it's really easy to self host and use.
Install and run [radicale](https://radicale.org/v3.html) and use the davx5 android app to sync with your phone. Your self hosted contacts and calendars will work phone-wise with any app. Preferably use foss ones like Simple Mobile Apps or Etar.
You don't need anything else. Is this worth a step-by-step guide? Cause it should be dead simple.
Discussion
Created the /n/selfhosted nostr community:
nostr:naddr1qq98xetvve5x7um5v4jqygxsm6lelvfda7qlg0tud9pfhduysy4vrexj65azqtdk4tr75j6xdspsgqqqsmmqeah0kc