How do I cut an access panel in an inside wall?
Most access panels have a lip that covers a good half inch around the perimeter of the opening, so you don't have to make the hole perfect. Pick up your desired panel from the store so you have a reference. It should include a door and a separate part for mounting on the wall:



Start by cutting your hole slightly smaller with a drywall keyhole saw.



Check for any obstructions with this hole and adjust the position accordingly to make your final hole. Use the panel on the wall as a template to mark out the position of the final hole, and then cut that out with either the same saw, a sharp utility knife, and/or a rasp: