OK, probably a dumb question that I'm sure I'd figure it out eventually (and I'm sure someone has already covered but I couldn't find it), but I didn't get to it before bed time last night and I want to finish getting one of my fenders off tonight because I have a welder coming by tomorrow am to look at some things...appreciate advice:

I found where the bolt on the middle rear and bottom rear of the fender go through to the inside of the car and have the nut on them...can I just remove those nuts from the inside and the fender comes off? (ie the bolt head is held by something?) or do I have to get to the head of the bolt somehow, and if so how do I get to the bolt head?

Thanks!!