I ordered window cling to provide privacy in the restrooms at my fitness club. I didn't want to eliminate all outside light coming in, but did want to allow some modesty for the members. I also used this product to block the sun coming through the transoms over my office windows. I started slowly with my first two windows, but soon discovered that I needed to smooth the cling material onto the glass using just my hands. The process went quickly and smoothly after that. The only tools required were a tape measure (to measure windows), a pencil and yardstick (to draw lines on the back of the cling) and a scissors (to cut). The film cut very easily and the lines/measuring marks on the back proved very helpful in cutting a perfect sized piece. I ordered a cling with a stained glass look and am very happy to see what a colorful, elegant touch it added to my business.