Well its really not that hard. The lights have a wide flat beam so you don't have to set them very accurately around the vertical axis. Approximately perpendicular to the road is fine. Around the horizontal axis, one way is to park in front of a wall or garage door and aim them just below straight ahead.

The bolt that attaches them to the bumper (its best below) provides the vertical axis and then there is a pivot bolt that allows them to tilt up or down. If they are snug but but not solid, its really easy to move them as required.

Here in SC we don't get a lot of fog but I use them on country lanes to spot deer about to take a death leap as they do a wonderful job of lighting up the banks on the sides of the road.