Turn off power to the work area
Remove baseboards, outlet covers, and wall fixtures
Score paint and caulk along seams and edges
Cut out damaged drywall with a utility knife
Remove drywall screws or nails
Pull off the damaged drywall pieces
Inspect and repair studs, wiring, or insulation
Measure the opening
Cut new drywall to size
Fit the drywall panel into place
Fasten the panel to studs with drywall screws
Tape the seams
Apply joint compound over tape and screw holes
Let the compound dry
Sand the surface smooth
Apply additional compound coats as needed
Sand again after each coat dries
Prime the repaired area
Paint to match the wall
Reinstall baseboards, covers, and fixtures