Always make sure an electrician is changing or installing the fixture. Below are simple steps the electrician will take to change a vanity light fixture.
It is recommended that wall sconces should hang about 5 feet above the ground. This is a universal height, so you still need to take individual measurements to have optimal lighting for you. To find the right height for the wall sconce, sit how you normally would on the bed. Then measure about a few inches above your shoulder. This will tell you the placement of the wall sconce.