Hi B3 - welcome to the party.
Use your air intakes to control your fire - and leave the exhaust wide open if you can.
As far as left over coals - after taking off your meat, shut down the intake and exhaust to put out the fire. Next day shake off the ash and keep the unused coals for your next cook.
Good luck with your butt - you got great advice from everyone so far. Take your time, make sure you allow some time to reset the butt in a warm dry cooler, and have fun. This quickly becomes an obsession.
Oh yeah - one more thing... throw on a fattie or 2.
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