Cutting a roller blind is fairly simple as long as you make the correct measurements. By laying the blind flat and marking out your desired measurements you will be able to ensure your blind is cut to fit your window. When it comes to cutting the blind, you should use sharp scissors for a clean finish. To help you out, we’ve put together the full instructions on how to cut a roller blind. Too long and you will need to repeat the process. Too short and you have defeated the purpose of the blinds. The bottom line: Use the right measurement and cutting tools when re-sizing ready-made roller blinds. Make the mark - Place one side of the measuring tape on top of the roller blinds' round top (i.e., the one with the metal pin). Scroll the tape to the roller blinds' required length and mark at several places using a marker. Make a straight line with a straight ruler following the marked places on the roller blinds' width. Make the cut - Cutting roller blinds at this point should be easy. Just cut along the marked line all the way to the rod; do the cutting slowly so as to preserve the material and to ensure a straight line. Use the sharpest scissors to ensure safety and accuracy when cutting the blinds. It must be emphasised that using dull scissors increases the risks for injuries because of the extra effort necessary to cut through the material. By using these scissors the results may also be unsatisfactory (i.e., more jagged edges).