I'm a long-time nostr enthusiast and i have no idea how to manage any of this outbox model stuff. Is there an easy (or easy-ish) UX planned for this? Can i just use Amethyst and not worry about it, or do i need to put forward a little effort? If it's the latter then what should my efforts be? 

 If you had to choose a single relay to host all of your notes, which one will be? 

That should be the only item on your inbox/outbox

Your client can check other relays, but your followers will only check your main one.  

 Can you add these instructions to Amethyst?