Like I said, if you have or can get a volt meter, you can test to see if it is the coil - it is really easy. That way, at least you know if it IS or ISN'T the coil.

I stripped the head of the screw on mine, which is why I had to take it off. I do have an impact driver, but there wasn't anything for the point to grab onto. Definitely mark it like Phateless said before you take it off. Draw a THIN line across where the top bolt goes attaches.