That systematic chart is super swell, but if you've got a bit of time, you could do it my(and many others') way:
1. Find a wall, fence or other vertical structure that you can park the car in front of. 5, 10, 15 feet away should be fine. Level ground makes this better.
2. At night, park with the headlights shooting straight at the wall. Note where the car is in relation to the wall.
3. Place pieces of tape or small marks on the wall where the headlight beams are hitting it.
4. Adjust the aim of the headlights up or down, left or right. Since you already know, or at least presume, yours are aiming too high, adjust them downward.
5. Go for a drive and check the visibility of the road.
6. Readjust as/if necessary. Be prepared to come back a day or a week later to make a final tweak once you've driven it around a little.