Measure 4 to 6 inches above the sliding glass door frame and 4 inches out (if you have the wall space), and mark this spot for the first bracket. Measure and mark the same distance on the opposite side, and measure and mark the center.
Use the stud finder to determine whether any of your marks fall over a stud and put an X through any mark that does fall on a stud.
Use the power drill to screw in drywall anchors at the marks, not over a stud until the head is flush with the wall.
Attach the curtain brackets using the power drill, but do not fully tighten the screws. Use the level to make sure each end is level with the center bracket. If slightly off, use your hand to nudge the bracket up or down. Once level, tighten the screws.
Slide the curtains onto the rod, and insert into the brackets. Adjust the curtains so they hang evenly between the center support bracket and each end bracket, and tighten the small screw found on the underside of the bracket until the rod is secure.