I did them myself. headlight comes out of the housing and goes into the oven for a few minutes to loosen up the seal. Once I got the glass lens off, I cleaned the areas inside the housing with cleaner and then drilled a small 3/8" hole in the back corner of the housing to feed the wiring for the halo out. Sealed up the hole with silicone and then reinstalled the lens. THe rest of the job consisted of running all the lengths of of wiring and mounting the drivers to the passenger side inner fender. Controller was mounted behind the kick panel on the passenger side of the tuck under the dash.