Ya need a box end wrench of some flavor that I dont recall. I do remember that ratcheting box-end wrenches helped. I think there are a handful of fasteners on each side, and it is pretty intuitive. It's been too long since I swapped them though.
IIRC, If that is the case, you are trying to remove the wrong fasteners. There should be a couple of bolt shanks on the headlights themselves, and once they go through the mounting cups, nuts screw onto the shanks. You dont touch the adjustment fasteners.
You need a 7/16" wrench, small hands and patience. There are 2 nuts on the turn signal and 2 nuts on the parking/marker lights. The headlight assemblies have 3 if I remember correctly.
Here's a tip when you go to put them back in...
The set of headlights I now have say "Ford" on them and they seem to line up properly.
The adjustment screws are upper inside and lower outside screws. If the headlights were re-assembled properly, they will have a 5/32" hex on the screw. You can use a 1/4" ratchet with a 5/32" socket. The upper screws can be reached with the hood up, while the lower screws may require you to lay on the ground in front of the car and reach them from the bottom.
To align the headlights, find a level spot with a wall 25-30 feet away. Disconnect the driver light and align up the passenger light so that the light pattern is slightly below of the actual centerline of the headlight. This is to illuminate the right hand side of the road. Reconnect the driver light and disconnect the passenger light. The driver light should be aimed so that the light pattern on the wall is inward about 6" and slightly below the centerline of the headlight. This keeps you from blinding the oncoming cars. Disconnecting and reconnecting the headlights helps to show which headlight is shining in what direction. Reproduction headlights may shine in several directions at the same time, making it very difficult to align them if both lights are on at the same time
One Stangnetter recommends putting a fender cover over the headlight that isn't being aligned. I like his idea, it's simpler than disconnecting the lamps.
Mine were seriously wedged in there between the outside lights, and I had to pull to the point of where I felt I was breaking something to get just the headlamp out.