I'm the typical amateur drywaller. Never leave that bit of mud in the pail. Spread it on the wall to be sanded off later.Same. It’s not longer fun! I still need to confirm with her but I’m scouring Kijiji and FBMP for electrical cable and insulation.
Interior is easier.
Remove drywall, frame, wiring, insulate, vapour barrier, replace drywall, mud, sand, mud, sand, mud, sand, mud, sand, paint.