This describes every single home improvement project we've taken on in our house. Every step of the way. My dream is to one day live in a house where the walls are mostly square and plumb, with studs that are 16" on center.
So now, we start every room with the nuclear option, and it goes like this: Step 1: Rent a roll-off dumpster. Step 2: Get the big hammer and gut the room down to the studs and joists. Step 2b: Try not to entertain the idea of arson. Step 3: new sub floor, wiring, insulation, drywall, floor, trim. Step 4: Live in relative relative comfort for a few months, and then repeat.