Run an electronic or magnetic stud finder along the desired spot on the drywall where you want to install the power socket or electrical outlet. Use a pencil to mark the edge of the wall stud to which you want to mount the socket’s electric box.
Use a pencil and level to draw a 12-inch square on the drywall, keeping one edge flush against the stud.
Insert the tip of a drywall saw into the wall at a corner of the pencil square. Cut through the drywall along the line, until you reach the other corner. Turn the saw at the corner and continue to cut along the remaining lines, until you loosen the drywall square. Remove the cutout and set it aside.
Remove the screws that fasten an existing power socket’s faceplate using a screwdriver. Measure the distance from the floor to the lower edge of this electrical box. Transfer this height on the stud where you will attach the new socket. Screw this faceplate back in place.
Position the tip of the screwdriver over the selected hole in the socket through which you want the electrical cable to enter. Use a hammer to tap the screwdriver’s handle and remove the knockout covering the hole. Slide the cable connector into the exposed hole.
Insert the electrical cable through the connector before tightening the screw. Place the electrical box against the wall stud, with its lower edge lined up against the mark in Step 4. Insert screws into the box to secure it to the stud.
Cut the insulating rubber coating around the electrical cable and peel off 6 inches to separate the three wires. Cut 1 inch of the coating from each wire using wire strippers.
Loosen two screw terminals on the new socket and wrap a black and white wire around each. Tighten the screws into place. Loosen the third screw, wrap the bare copper wire around it before securing it in place. Push the wires and the socket into the electrical box attached to the stud.
Secure the socket to the electrical box using the screws provided with the assembly. Also secure the faceplate over the socket with screws.
Cover the gaps around the socket and drywall using a drywall patch repair kit. Most kits include a wire mesh you spread over the gap and cover it with drywall mud. Let the mud dry according to manufacturer’s directions before applying a second coat of mud over it. Sand the second coat until it is smooth.