If the is a need to shorten the blinds, you need to accurately determine their requireed leength, and the Start Cutting. Vertical Blinds are shorted with scissors, and the Guide Rail — With a Hacksaw For Metal. Horizontal Blinds Are Laid Out on a Flat Surface and Carefullly So as Not to Hurt the Lamella, Cut off the Rails and the Cornice. To Adjust the Height, You Just Need To Remove the Lower Rail and Untie the Cord. The Remove Excess Lamellas, Fasten The Rail and Cut the Remaining Cords.