Adjusting headlights

[THR347]

Hey all,

I was following my dad at night a few days ago and he mentioned that my headlights were a bit blinding on low beam, especially the drivers side. I've even had people in oncoming traffic flash their lights at me. That being the case, i had a look in my manual and under the bonnet and found the orange screw tabs that adjust the angle of the lights but how do i properly aim the beam? Trial and error? or is there a method? The car has the quad hole xr style lights if that helps.

Cheers in advanced. Adz.