Basics of working DRYWALL cutting striaght lines as well as holes. Unless your room is a perfect 4' x 8' square, with no openings, you will need to cut drywall to complete your project. Take time before you begin to accurately measure and purchase drywall panels to reduce the amount of cutting you will have to do. Use full sheets wherever possible during the project, and always cut the drywall panel to length so that the end falls in the center of a joist or stud. You will then be able to attach the next panel to the other half of the joist or stud. Making cuts along the length of a sheet can be tough. One method is to snap a chalkline along the sheet and then score the line by hand. You may also use a tape measure to mark out accurate guide lines.