I know this picture isn't much help but this might give you a better idea of what the headlight assembly entails.
The cornerlight and headlight are attached to a black painted metal housing. Two bolts (10 mm heads and found one above the other, verticlaly, and located next to each headlight itself, toward the center of the car) bolt though the black bracket assembly to the the support bracket (body color) which is mounted to the radiator support. In addition to those two bolts, at the outer corners, behind the headlight assembly, there are two "guide pins" that can't be seen that are on the back of the corner lights that hold the outer corner of the whole assembly in place.
So, after undoing the two bolts, the whole headlight assembly (black bracket with headlight and corner light still attached) needs to slide horizontally, away from the center of the car, toward the outer corners to get the guide pins out of the holes. You may need to push down a little bit on the front bumper, under each headlight, to help the assembly clear the bumper while sliding it out.
Hard to describe, but once you have removed one and examine the guide oins and the holes they slide into, it makes it easier to understand.
Here is a picture of the back of a corner light where you can see one of the "guide pins"