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You should wait at least 24 hours between each coat of drywall mud before sanding and adding another coat. This ensures the mud dries completely, although drying time depends on temperature, humidity, and the type of compound used. Lightweight muds dry faster, while heavier all-purpose compounds take longer. Always check for firmness and dryness before sanding or applying the next layer.

Two of the biggest mistakes with drywalling are not measuring (and therefore buying the wrong amount of drywall) and trying to install drywall yourself. A sheet of drywall can weigh around 50 pounds, so it can be difficult to install without a pro or at least some experienced friends willing to help with a DIY installation. It can also get expensive if you don’t measure at least twice before buying the drywall sheets.

You can drywall an unheated garage because the material handles cold temperatures perfectly well. There are no risks or downsides to installing drywall in a garage that is not heated, and the material stands up to moisture and other elements quite well. Drywall will protect your unheated garage's electric wires and cables and add fire protection. However, for effective bonding, you should install drywall at a temperature of 55 degrees Fahrenheit or higher.

A 50-pound mirror can be hung on drywall, but only if it has the support of strong hardware. Ideally, you can find the studs behind the drywall and attach the mirror to them; this will give your mirror better stability. Otherwise, confirm that you are using anchors appropriate to the weight of the mirrors. Another technique is to use French cleats—two pieces of wood that fit together, with one piece attached to the wall and the other to the mirror. This allows the weight to be distributed over a wider area.