Before starting to tear down a wall, make sure it's not load-bearing and that no plumbing or electrical lines are in the way. If any utility lines are in the wall – but the wall has to go – call in a qualified professional to deal with them.
Clear out the room and spread a plastic drop cloth before getting started. Even the tidiest drywall removal makes a big mess.
Measure and mark the area of wall to be removed; for this project. Score over the marks with a sharp utility blade.
Use a hammer or small sledgehammer to break out the drywall, taking care not to hit the wall framing. Use a drywall saw or reciprocating saw for accurate cuts along the scored lines.
Use a reciprocating saw to cut through the wall studs and framing. Also use the saw to cut through the sill. Use a prybar to remove any pieces of the sill that are attached to the floor.
Remove and dispose of all debris from the demolition. Be especially careful when handling and disposing of insulation: Brightly colored insulation can attract curious kids and pets, who could be seriously harmed.