Measure the opening after tiling is completed. Take measurements at the base, at a height up to 5 feet, and at the halfway mark. Write down accurate measurements to within 1/16 of an inch.
Check for plumb with a long level. If the enclosure is not plumb, determine where the panel will need to be wider or narrower.
Draw top view and front view sketches of the shower. Fill in the measurements. Take the drawings and measurements with you when you order the door.
Position the hinge in the center of the door's hinge cut-out. Carefully finger-tighten the rear screws. Attach the handles.
Put the door into position. Shim the door so that there is 3/8-inch clearance on the bottom for the sweep. Mark positions for holes.
Use a 1/4-inch masonry bit to drill holes. Use high quality wall anchors or drill into a stud. Insert the screws through the hinge into the wall with a drill. Start with the outside top and outside bottom holes.
Attach the vinyl sweep to the bottom of the glass door. Trim at a 45-degree angle so that there is a 1/2-inch extension on each side of the door.