Measure the length of the ceiling joists in the area where you plan to install the sheetrock. Measure the distance between each joist. Mark the location of the joists on a section of sheetrock with a pencil.
Place a stepladder underneath the joists. Apply a thin line of construction adhesive along each joist that the piece of sheetrock will cover.
Move the stepladder out of the way. Roll a drywall lifter underneath the installation area. Position the sheetrock on the lifter. Turn the crank to lift the sheetrock up to the ceiling and push it into place.
Move the stepladder into position beside the drywall lifter. Drill screws into the joists at 12-inch intervals with a drill. Use the pre-marked areas on the drywall as a guide to determine where each ceiling joist or “stud” is located.
Turn the crank on the drywall lifter in the opposite direction to retract the machine's arm from the sheetrock. The construction adhesive and screws should hold the sheetrock in place on the ceiling.