Not sure if heat on the plastic helps............. However I had to change my head lamps for european ones when I moved here to France. When I tried to undo the securing nuts, they stayed in situ' and the studs turned instead!
Not sure how you would overcome this snag, which is common.
Luckily for me as I was replacing it was no problem to break the old ones to get them out. The lenses were chipped & reflectors shot so not even worth trying to save them really.
I got my new Euro ones from Volvo 'mainstealer' here OUCH!
Good Luck
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