Step 3: How to apply
Is to place your tape straight on the keys, keeping it taut by rolling some extra on the keys next to it.
Then take your exacto knife and cut the tape the exact size of the key. I used the detail blade that I got with my knife.
A side note I might add, the tape is much like painters tape so you can pull it off and re-apply if you don't get it on straight the first time.