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Spray with Kroil or something like that, then put a wrench on it and tap that repeatedly (100 times, OK) with a small metal hammer or something.
Then try to twist it. Lather, rinse, repeat.
Taking it to a pro might be OK, but what if they damage the car? At best, you'll be out of action for a while. At worst....
Look at the plug carefully -- new ones are cheap. Buy the ext. hex type.
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