Mark the studs before you lift drywall into position. Position the drywall directly below where it will be installed. With a builder’s crayon or pencil, mark each stud’s location 7 in. down from the top edge.
Drywall edge trimmer - If you have to trim about an inch off the ends of our drywall, this is a tedious work with a utility knife. So I screwed together some pieces of 1x scrap to make a cutting guide and attached a couple of "snap-off utility knife blades to its top edge (see drawing). When I slide this tool along the edge of a piece of drywall, the blades cut from both sides, making it quick and easy to remove uniform strips from a sheet of drywall.
DIY Tip of the Day: Easy Plaster Cleanup. Simplify cleanup when drilling holes in plaster or drywall by securing a bag to the wall with masking tape, then drilling through the tape. Dust and chunks will fall directly into the bag, which can then be reused or tossed.