is this a body kit or lip kit...now if its a body kit you have to take of fyour stock sides....i think Brett on here has a lip kit you can ask him how he put his on.....now as for a body kit, i always put all my sideskirts on with selt tapping screws....2 on the front of the sideskirts and 1 on each end ( probably have to take your wheels off if its lowered to get the drill space)...paint it while installed this way it all matches, sometimes they use different colors when painting speratly