I got two rolls, which should have been enough, but there are regularly spaced parallel marks running down either end of each roll, so to get the windows to look nice, I had to cut off 6 inches along each end, making the roll more like 2 ft X 6.5 ft.
My windows ended up looking really nice, but it took a lot of time and effort.
My suggestions for installation:
Not included tools:
spray bottle with water inside
Small plastic spackle knife with a square corner (to get into the corners of the window)
window cleaning fluid
xacto knife (and several blades if you are doing a lot of windows)
sturdy thick metal ruler/yardstick for cutting straight edges
newspaper or some piece of cheap paper as big as your window
1. Measure your window. Be as exact as possible.
2. Cut a sheet of newspaper to the exact measurements of your window
3. But the newspaper over the window. Modify your exact measurements, noting where you need to add or remove material.
4. Cut another sheet of newspaper to the newly corrected exact measurements of the window
5. Repeat 3 and 4 until you have it right.
6. Use the final newspaper sheet as basically a stencil for cutting the actual film. Make sure that there are no blemishes on the part of the film that you are using—there were a lot of blemishes along the edges of my rolls.
7. Carefully wash your window with the fiber free cloth. The corners are especially important.
8. Separate a corner of the film from its plastic backing and put your finger in there
9. Spray the window with water. Put a lot of water on there, and then quickly separate the film from the plastic and put it into place. The faster you go, the more water will still be on the upper parts of the window and that will make the film easier to slide around into place
10. Use the included squeegee to get air/water bubbles out
11. Use the spackle knife along the edges to get out remaining bubbles. If you have a stubborn bubble along an edge, instead of trying to get it to go out the nearest edge, try pushing it towards a different edge.
12. Use the regular cloth to dry off the window and sill.