Adding to the above techniques, here's something I read and think makes things easier. Instead of printing on plain paper, you can get adhesive printer paper (labels, but the big ones, A4 size), which you print and stick on the monokote backing. It is much easier to cut when the paper is glued on, and when you take the backing of the monokote the paper comes off with it. Just remember, since you're cutting from the back side, to print the letters mirrored. You can do that with any drawing program, even with Windows Paint. Unless you want the other pilots to be able to read what's on your plane through their rear-view mirrors

Serafim