I have a 1997 F250 and I am attempting to change out the driver's side headlamp.
Unfortunaltey the coolant basin is in the way and there's a cover on the front end of the engine area that covers one of the bolts that holds the coolant basin in place.
That cover doesn't appear to just simply unscrew and without moving the coolant basin, I cannot fit my hand down to where I need to replace the burnt headlight.

Suggestions on how to accomplish what seems to be a simple task?

 

Hope this helps or at least points you in the right direction.
If you have the plastic lenses and are just going to change the "bulb", on the top of the housing there should be two "tabs" about 3/4 inch flat metal on the left and right sides.
If you pull/wiggle them up, this will release the housing and then unscrew the bulb holder to change.