Measure 3 inches in from the inside of each corner. Place a hanging bracket parallel to the window frame corner. Place its center hole at least 2 1/2 inches from the surface of the window or any handles or other hardware. Mark the center hole with a pencil. Repeat marking on the other inside end of the top of the window frame, also known as the header.
Drill holes at the pencil marks. Use a bit large enough to accommodate the tips of the drywall anchors. Tap the anchors in lightly.
Attach the bracket mounts to the inside of the header by inserting the screws through the hole in the center of the bracket and screwing them into the drywall anchors. Add brackets at least every 30 inches between the two end mounts.
Slip the lip on top of the headrail over the fronts of the mounting clips. When the front of the headrail is hanging, rock the headrail onto the back clips until it snaps through the lip on the back of the top of the rail.
Attach the control wand, and turn it or adjust the rotation chain so that the vane clips are perpendicular to the window. Pull the traverse cord gently so the loop in the headrail is straight and no cord hangs out of the rail.
Attach the vanes, starting at one end of the headrail, putting the rectangular openings atop the vanes into the clip, and then snapping them closed. Check all vanes, especially S-shaped or fabric vanes, to make sure they face the same direction.
Test the vane control and traverse cords to ensure that both work evenly. Snap the tension pulley over the traverse cord loop, and pull it firmly without stretching as far toward the floor as it will go, then mark the wall and screw in the wall mount. Snap the pulley onto the wall mount.