Working with mirrors is a significant undertaking because of the large, heavy pieces of glass involved. An improperly hung mirror can be disastrous not only to the wall but also to the mirror. Smaller and medium-sized mirrors can be hung on drywall with toggle bolts or molly screws. If the mirror’s light enough, simply using hanging wire or a J-hook might be enough. Because of its size and possible strain on the wall, a large mirror or vanity should be mounted to the studs. If improperly installed, heavy mirrors, such as vanities, can become unattached over time. If a large pane of glass falls off the wall, it could create a dangerous mess.