This step will be easier with the help of another person who can hold the mirror in place while you make the markings. [1] X Research source Clips are best for small frameless mirrors. If you are hanging a large mirror, use J-channels or Z-clips in place of regular clips, which can support more weight.

To use a spirit level, look at the bubble in the tube. If it is equally spaced between the two black center lines, then your edge is straight. If it slides off to one side, adjust the angle of the level until the bubble sits in the center. [2] X Research source

Power sanders are the simplest and quickest method. You can also use sandpaper wrapped around a wood block.

If you don’t have a stud finder, you can approximate the location of the studs by tapping on the wall. Taps between studs will sound more hollow, while taps over studs will sound more solid. [4] X Research source If the mirror is positioned so it falls squarely in between studs, consider shifting its location so at least one clip can be screwed into a stud.

Make sure to align the bottom edge of the clip with the line you drew marking the bottom edge of the mirror. The markings for the pilot holes will fall 1⁄2 inch (1. 3 cm) to 1 inch (2. 5 cm) above the line, depending on the size of the clips.

Make sure you’re using the right clips. Bottom clips are typically made up of a single U-shaped piece of material, while top clips are composed of two L-shaped pieces.

Similar to the bottom clips, the pilot holes should fall 1⁄2 inch (1. 3 cm) to 1 inch (2. 5 cm) below the top line.

The painter’s tape marks the area where the mirror will be glued to the wall. Keep in mind that adhesive is a more permanent solution. It will damage your wall and likely your mirror if you try to remove it once it has been glued on.

If you’re installing the mirror in the bathroom, you can often use the countertop backsplash as a bottom support rather than installing a temporary brace. [8] X Research source

Make sure you are using a type of mastic that is specifically intended for mounting mirrors. Using another kind could damage the silver coating on the back of the mirror. [10] X Research source

For additional security, stick pieces of painter’s tape to the top corners of the mirror until the glue dries fully. Allow the mastic to dry for about 24 hours. [12] X Research source

Make sure to check your local building codes. Some areas may require clips in addition to adhesive when mounting mirrors. [13] X Research source