Remove lower valence. Use C clamps to hold the air dam in place. Make sure everything is lined up straight. Mark where mounting holes will be. Remove air dam, and drill holes. Now bolt air dam in place BEHIND headlight buckets. Not in front. You will also bolt the sides of the air dam to the front/lower portion of the fenders. Basically where the stock valence bolted up. My air dam only allowed one bolt per side where it meets the fenders, but some might have enough lip there to run two bolts per side.
^Agreed. I installed mine myself, and it was not that hard to figure out. I would think a body shop should be able to do it easily.