My suggestion for an ultra newbie: Get the @YakiHonne app or go to the web client at yakihonne.com, and set up a new wallet. Choose “Yakihonne’s NWC” which will instantly create a wallet for you that you can plug into any Nostr client. Copy (back up in a safe place!) the NWC connection string. As long as you have that you can access the wallet. Paste that into to any client you want, and you’ll have the same wallet and Lightning address anywhere. Just remember it’s someone else’s node, so keep a responsible balance there.