Measure the area that needs to be covered with drywall. If the ceiling is oddly shaped, break it down into separate sections.
Measure and mark the cut lines onto the drywall.
Place a straightedge against the cut line. Create a score line in the drywall with a utility knife.
Snap the drywall at the score line, then cut through the paper on the back side with the utility knife.
Measure and mark cut lines for any objects such as outlets, ceiling fans or light fixtures onto the drywall.
Cut holes in the drywall along the cut line with a keyhole saw.