To start with, I would check the two lights against a door with horizontal lines, like a garage door. Compare them for height, and if they do not match, adjust them so they do. I have usually parked on a road without traffic and walked down the road with my lights still on and looked at the car as if it were traveling towards me. If they seem heigh to me, I move them down. You can usually tell left to right when you are driving, or the test where you look at them. Good luck. Maybe someone else will have a much more impressive way of doing it.