Before you make any adjustments though, the units don't pysically go out of alignment all that easy, unless you've had an accident. And you'd notice the whole light cluster would be squint.
Personally the first thing I would check is that the bulbs are fitted correctly. Of all cars with replacement bulbs fitted I'd say 80% have them fitted incorrectly. You can tell this is someone has replaced 1 bulb and one headlight is dazzling the hell out of you, its because the bulb is likely fitted 90 degrees out.
A bulb can only be fitted correctly in 1 way. So even though its a paintful job (skint knuckles) its worth check each bulb, remove and refit to be 100% sure the bulbs are fitted correctly.