Measure the width of the head rail to determine how many brackets will be needed. Set an end bracket 1 inch from the edge and mark the mounting screw locations through the holes on the back of the bracket. Mark the two holes with a pencil. Repeat the process for the other side. Add a bracket every 30 inches along the head rail. Line up a level to make sure it is plumb and square.
Pre-drill into the pencil marks with a wood drill bit. Drill through the marks on both sides of the window and line up the first bracket to the holes with the surface marked top facing up. Insert a screw into each of the two holes to secure it in place. Repeat the process for the bracket on the other side. Install the bracket along the interior in the same manner. Line up a level to make sure your work is perfectly straight.
Clip the back lip of the head rail onto the spring tabs of the mounting brackets. Ensure that the head rail is installed properly and is secure before installing the shade.
Turn the front of the head rail upward to move the top mounting tab of the bracket. Snap the shade onto the bracket and lock it into place. Check to make sure everything is perfectly secured before moving the shade up and down.
Pull on the shade to move it down and check to make sure it works properly. Pull the shade all the way down and then pull down slightly and release it to allow it time to go back up.