Duke William of Normandy won the battle because was well prepared and had a good army. They prepared carefully for the battle. The Normans had knights on horseback who were skilful fighters.
A utility knife, metal ruler, and a hammer can be faster than trying to carefully saw an opening. Score the drywall a couple times till you are most of the way through, then just knock a hole with the hammer and break the drywall back at the score lines.
5. Cut the corner to a 45-degree angle using a drywall keyhole saw. Grasp the handle with one hand, and with the other hand grasp the sharp tip of the saw. Hold the saw horizontal to the floor, and pull downward while cutting about 1/2 inch of the corner away.. Cut into the corner with a hack saw at the mark. Hold the hack saw parallel to the floor as you cut into the corner. You must cut through the existing metal corner bead completely.