Measurements need to be taken to determine where to install the brackets. Mark the location with a pencil. Install the brackets using long screws, molly bolts or other fasteners if necessary. Install the headrail of the blinds into the brackets and add the valance clips and then slide in the valance. The slats or vanes are then snapped in one at a time.
All blinds come with complete installation instructions for their product.
This is an overview for those considering installing the products themselves. The products you purchase may not be installed exactly as described here. Usually snap in brackets are supplied with most cellular and pleated shades. First the brackets are usually installed in the upper window frame. The headrail of the blind is then inserted into the front edge of the brackets and then rotated and snapped in.