Basically, you type up your desired text, print it, and tape it to your surface:
Then trace around each letter, pressing down firmly:
Peel your template off, and fill in the letters!
Et voila! (Or "wa-lah," if you're a flaming moron.)
Tips: first off, obviously choose a simple font, and make it BIG. This was a bit hard for me to outline and to fill in accurately. Secondly, PRESS HARD when outlining. Mine's obviously not perfect, and part of that is because I didn't have clear enough indentations on the book cover. Beyond that, it was the work of minutes! Good luck!