Finding a stud can be useful but not necessary if you have a strong enough hanger.
How to hang up a wall mirror.
Gradually reduce your hold on the mirror until it is fully supported by the cleat.
Lift the mirror into place and lock the two cleat hooks together.
Place a scrap piece of wood that is approximately half as long as the mirror is wide underneath the hanging wire on back of the frame.
They should fit together like jigsaw pieces.
Set the mirror down.
Mark the location of the top edge and the center of the frame.
Note if you ve used wood glue to secure the mirror s cleat be sure to wait until the glue is completely dry before hanging the mirror.
Use anchors if the bottom cleat isn t lined up over wall studs.
Find a place to hang the mirror.
Hold the mirror against the wall at the desired position.