1. Yes that's it. Mine is a hex head tho, directly above the gold sticker.
2. Cold stopped engine, fill radiator, open bleeder, wait until coolant comes out, close bleeder, top up radiator. I've never bothered to have it run at all, let alone warm it for bleeding.
3. Just be careful, you'll only get a slow flow and you stop it by replacing the bleed bolt. Its not a problem - you're over thinking it
4. Just be careful not to overtighten the bleeder and snap the bolt. BTDT.