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Use a stud finder to locate your wall’s studs, and mark the locations of the studs with a pencil. Bathroom walls can conceal pipes and electrical wires, so you should use caution if your stud finder identifies any other objects behind the drywall. Drilling through pipes or wires can result in expensive damage. If you are concerned about possible pipes or electrical wires, consult with a professional before you drill or cut into the wall. Position the cabinet at a height accessible to your household members. Usually 72 inches from the floor is a good place to start, then adjust the height according to your needs. Place a level at the top of the cabinet to make sure it’s straight. Use a pencil to trace the top and bottom outlines of the cabinet.  Having a helper to hold the cabinet in place for you will make the job easier. Try to line up the cabinet with studs for the best support. If you can’t line the cabinet up with the wall studs, you’ll need to use plastic anchors when you drill pilot holes. With the cabinet still held in place, open the door and make sure it’s free of any obstructions. Locate the installation holes at the rear of the cabinet. Use your pencil to mark the holes on the supporting wall. Set aside the cabinet in a safe place. Drill pilot holes into the pencil marks you made on the wall that line up with the cabinet’s installation holes. If weren’t able to line the installation holes up with the wall studs, insert plastic anchors into your pilot holes. Position the cabinet back on the wall so the installation holes are lined up with the pilot holes. Drive screws into each hole to secure the cabinet to the wall. Some cabinets come with washers or plastic bits to conceal the screws once they’re fastened. Check your cabinet’s installation guide for specific information about these or any other included hardware.

Summary:
Scan the wall with a stud finder. Hold the cabinet in place and make sure it’s level. Open the cabinet door and mark the installation holes. Drill the pilot holes. Fasten the screws to secure the cabinet.