Measure the window with a measuring tape to determine if you are installing the blinds inside the frame o outside. It is a matter of preference, but inside mount provides a cleaner look and outside mount will prevent more light from seeping in through the sides. Inspect the package to make sure you have all the clips and screws to secure the blind in place.
Measure 1 inch out and 1/2 inch down from the window frame for outside mount blinds. Draw a line with a pencil at each location. These will be the locations where you will install the brackets.
Place a line 1/2 inch down from the top of the window frame and 1 inch in from each side edge of the window frame for inside mount blinds.
Hold one bracket against the marks you drew draw a mark with the other hand to mark where the screw holes will be. Repeat this for the bracket on the other side. Use a level to make sure the marks are even with each other on both sides.
Screw the brackets into place.
Slide the headrail, or long metal piece that holds the blinds, into position by inserting the front edge in the mounting clips and pushing backward. The blinds should lock into place on the mounting clips.
Set the metal valance end pieces into the corner of the valance and they should snap into place. Slide the valance clips onto the headrail, beginning at the ends, and evenly space them. Place the valance into the valance clips on the head rail to lock them in place.