The best way to cut through a drywall ceiling is with a reciprocating drywall saw. This is a device with a very sharp blade on the end that moves back and forth at a very rapid pace. When you need to cut through the drywall ceiling, you should start out by marking exactly where you want the cut to be made. Then when you turn on the saw, try to work as slowly and carefully as possible. It can be difficult to control the saw, and this could lead to mistakes and safety hazards.