The best recommendation for aiming them is to use an optical beam setter. . . Brian -
Nope, not true for European-code headlamps, only for US DOT junk.
Daniel Stern's directions are spot-on.
All you need is a place where you can park your coach on a flat surface 25' away from a blank wall that's not brightly illuminated at night. Bring along a couple of dark towels, a straight-edge (a carpenter's level works wonders), tape measure, some white sidewalk chalk and a stiff-bristle scrub brush. Can be done alone, but a companion will speed up the process. Should take you 20 - 30 minutes, max, if you understand Daniel's directions.
Might want to wait until it warms up a bit, tho!
FWIW & HTH. . .