Since you are in Clarksville, you could take your car down to Ft. Cambell, dive down to one of the rifle ranges, and practice running over the targets until your aim gets better.
J/K Best way to do it is to point your car at a wall or garage door on a level drive way, and poit the lights where you want them with the adjusters. there shoud be two adjusters per light, one for up and down, and one for left and right.
