Use the measuring tape to get the depth and length of the space where the built-in desk will be mounted. Write down the figures. Draw the desk surface top on the 1-inch plywood sheet using the depth and length figures just collected.
Cut out the built-in desk using the circular saw. Use the medium-grit sandpaper to sand the desk's edges.
Use the wall stud finder, if you are attaching the built-in desk to a wall. Find the wall studs in the wall and use the pencil to mark them. Attach the shelving brackets to the wall using the cordless drill and 1-inch-long screws. If you are attaching the desk to a wooden furniture panel, simply attach the shelving brackets to the wooden panels using the 1-inch-long screws and the drill. Ensure that the shelving brackets are evenly placed on both sides of the built-in space, so the desk surface is even.
Place the desk surface in the chosen space, so the desk surface rests on the shelving brackets. Attach the desk to the brackets by screwing 1/2-inch-long screws through the brackets into the desk from the bottom up. Do this for both brackets to ensure the desk is firmly secured.