wings west is not pre-drilled but it is not necessary.
the front and rear snug the bumpers perfectly. the front lip sits over the existing stock lip, just slide it over and screw it in (screws included). the rear apron has double sided tape, put it in position & stick it on, then screw it on. the side skirts are the tricky ones, mine didn't fit and i had to have the door sill part cut to fit so the door could close completely, but again it has double sided tape, so stick then screw.
you can easily do it yourself. all that is necessary is jacking up your car, removing your rims, sticking, and then screwing.