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The easiest way to cut holes in drywall for electrical boxes is to use a spiral saw with a drywall router bit. Hang the drywall without cutting out a hole for the box, but make sure you measure and mark where the box is located on the wall. Once you screw in the drywall sheet, drill a small hole into the box void, insert the spiral saw bit, and move it around the edge of the box using the inside wall as a guide. You can also use an oscillating multi-tool with an electrical box cutout for fast, professional results.

You can prevent air leaks and sagging by gluing a drywall ceiling. However, not every drywall job is a good fit for Sheetrock adhesive, and many pros say ceilings are one of those cases. When you place them properly, drywall screws make ceiling Sheetrock part of your home’s structural support system. 

Adding glue won’t increase the strength of the drywall, and it can make it much harder for you to remove and replace damaged drywall. Adhesive can bridge gaps, though, and it can keep temperature-controlled air from escaping or entering through the ceilings, making rooms more energy efficient.

You should stagger drywall sheets to help prevent cracking. The joints between drywall sheets are the weak spots, so if you install drywall with seams aligned, you’ll create weak lines that run across the length of the wall and extend from floor to ceiling. But when you stagger drywall, the solid sections of panels will support the joints. This can prevent seams from cracking or separating due to fluctuating temperature and humidity, vibrations from movement inside the home, and gravity.

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.