Should have taken a photo of all 3 adjustment holes with clear arrows indicating which is which. But from lowest to highest, first is the headlight release. Next (right above), with a blue plug (which shouldn't be touched), is the headlight horizontal adjustment. And last (highest), offset a little, is the headlight vertical adjustment. For the release, you insert the tool below the headlight, and you need to push it forward, meaning turning tool clockwise on driver's headlight, and counterclockwise on passenger one (US cars, of course

). It takes about 1/4-turn, and sound is not pleasant, but nothing is going to break. After some force, it'll 'CLACK' forward, then you just pull it slowly until the harness stops it, then patiently remove the plug for complete removal. It's a little tight in there, but perfectly doable, even with large hands. Hope this helps.