Cost me an hour of my time and the 6" of masking tape I used to hold the drill templates in place.
Seriously though, installing this spoiler is a very simple task. If you already have the factory blade spoiler it is even simpler since there are no holes to drill.
especially mmd...mmd is super easy with strips of paper as the template. only way you can screw it up is by not lining the spoiler up on the back of the trunk and screw up taping the strips down.
roush on other hand has a giant template the size of the trunk but still easy.
drilling is the easiest part. start with small bit and work your way up. it's so thin it will be over before you know it.