Ford Repair: installing headlights, glass envelope, headlamp switch

Question
i am trying to replace old headlights with new ones on 1997 mustang gt 4.6. i am having problems removing old lights. they are held in by looks like round nuts and i can not loosen them. do i need a special tool? please help. thanks

Answer
Hello and thanks for the question...I'll try to help.
REMOVAL:
Place the headlamp switch in the OFF position. WARNING: THE REPLACEABLE HALOGEN HEADLAMP BULB CONTAINS GAS UNDER PRESSURE. THE HALOGEN HEADLAMP BULB MAY SHATTER IF THE GLASS ENVELOPE IS SCRATCHED OR IF THE HALOGEN HEADLAMP BULB IS DROPPED. HANDLE HALOGEN HEADLAMP BULB CAREFULLY. GRASP HALOGEN HEADLAMP BULB ONLY BY ITS PLASTIC BASE. AVOID TOUCHING GLASS ENVELOPE. KEEP HALOGEN HEADLAMP BULB OUT OF REACH OF CHILDREN.
Remove the headlamp dash panel junction wire from the headlamp bulb and retainer by pulling it rearward.
Remove nut retaining side parking lamp and remove side parking lamp by pulling it straight out.
Remove headlamp mounting clip from upper outboard adjusting screw.
Squeeze the retaining tabs on the remaining headlamp screws and push the studs forward to release and remove headlamp assembly.

Hope this helps,
Erik