To ensure accurate blind installation, precise window measurements are crucial. Measure the width at the top, middle, and bottom of the window frame. Height is measured from the top of the frame to the sill. Inside mount blinds are installed within the frame, so deduct 1/2″ from the width and height. Outside mount blinds cover the frame, so add 2-3″ to the width and height. Consider blind type, such as roller or cellular blinds, to determine the best fit based on window size and functionality. Ensure proper overlap and clearance for optimal light control and aesthetics.