Clean the surface of the skylight with glass cleaner and paper towels. Remove all fingerprints, dirt and smudging.
Clean the window with the soap and water to remove all chemical substances.
Peel off the back of the window tint, exposing one sticky side. Apply the sticky side to the surface of the glass.
Smooth out all bubbles with your squeegee, leaving the tint lying flat over the glass.
Trim any excess tint from the edges of the skylight with your razor blade.