1996 SL500, 2000 E430, 2011 E350
I have always used one of those spark plug starters, where you have a flexible extension and turn it by hand. Got mine at Sears years ago, but I guess that option is no longer available,It was the same story with fan clutch nut. The previous monkey applied about 200 lp-ft. to the nut which took a cheater pipe to break. Anyways, first plug change on a new to me car is always nerve racking. Don't want to pull threads out of alloy head.
Here is the equivalent on Amazon. I once saw someone in a shop start theirs with an air ratchet! I am almost paranoid about cross threading those!
And FWIW I have switched camps on the "should you are shouldn't you" put anti seize on those threads. I have switched to the "don't" camp.
My neighbor had a 380SL and had a shop do an oil change- they apparently cross threaded the plug and instead of telling her put RTV silicone all around the bolt. Who knows how they started that bolt.