Step 3: Cut out a rectangular opening for the patch
Use a keyhole saw to cut from the opening to the lines marked for the patch. This will create a lot of dust and debris, so use a vacuum to suck up dust and a drop cloth to protect the floor. Always wear a dust mask and goggles when demolishing old wallboard. Follow the cut lines around the patch area and switch to a drywall saw to square the corners.
 Use a keyhole saw to cut from the opening to the lines marked for the patch.
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