Just like wheel alignment, you don't need expensive tools, you can do it yourself as long as the extensive time and measuring are worth it too, instead of just taking it to a garage and have them do it.
Look up the spec for headlight aiming, it usually X" down and Y" right of center point of the headlamp at Z' away. Usually 25', but with a little simple geometry/trigonometry you could calculate that for a shorter distance. Get a big piece of cardboard and mark the points and then move it back with a way to ensure its lined up still. (Cheap laser pointers can do that quickly) and adjust the center of the beam.
But these improvised techniques, require that you measure again and again to make sure you've got everything lined up accurately, adjust and measure again and again, it gets into hours that your doing. When you could just run down to your local garage and have them use their professional tool that can do it in minutes.