Here's some links to check out. Just some info I found, I have not done it yet myself.
http://news.carjunky.com/how_stuff_w...s-abc449.shtml
http://www.danielsternlighting.com/tech/aim/aim.html
or
tape measure & garage wall & darkness are all that is required
first measure the height of the headlights to the center of bulb
then park the car 25 feet away from a wall at night , turn on lights an adjust the beam to be 6 inches lower then the bulb on the car ...... DONE with height
next measure the distance the bulbs are apart on car ..
using same wall make the beams straight ahead first ...
then adjust them towards each other 6" per side