If ya wanna spend some $$$ to get them perfect, go to a bodyshop with a headlight aiming machine, they do exist, I didn't know they did until my auto class teacher got 1 for the shop over the summer. I'm the kind of person who just uses a white garage door, the machine is too confusing for me, it rolls on 2 tracks that you set up beside the car, then you use a viewer on the machine to put the pinpoints in and get it perfect.