Start installing apps from zap.store or obtanium rather than Google store. Much more convenient than downloading APK from somewhere. 

Use Amber to generate/store your secret key on your mobile device. 

Login to Amethyst with Amber. Or use Primal, but only if it allows login with Amber (did not since a while ago. 

Amber, Amethyst and Primal are available form zap.store. 
Amber is also on F-Droid, not sure about the other apps. 

Also not sure what's a nice and easy Nostr Relay to install on a computer or a Raspberry as I've not explored the options yet.  

 Never heard of either of them. Good #knowledge, rewarded with #sats.

I still stand by #Apple fans being screwed though.