I must say that paint job looks nice even perfect so stay positive. Car restorations are an art form that pulls on our psychology with rewards and failures that can be difficult to process and not for the impatient. I must admit John reminded me of that; anyways what I am saying is stay positive walk away and come back; one day can make a big difference in our thinking. You have a beautiful example of paint and body work in front of you, and like all the guys are saying put that blue painters tape in areas and on pieces that are going to or maybe get scratched. Plus if the tape feels too sticky put the tape on your jeans a couple of times to dull the tape.
One thing I noticed in your picture is that the last bolt area on the fender is on top of the drip edge of the tub. It is really not a big deal and you could leave it. I have seen that many times, and I am still not sure if the factory ever cared or not. In the past I have notched the fender tip so that the fender lays flat on the tub and other times notched the tub, and sometimes the 2 need to move some, and I have left it, but if your apron does not fit at the tip you might mess with it. I did not want to cause more stress, but sounds like you a perfectionist like many of us here, yet I will add to that- that perfectionism is defeated by mother nature every time. We just keep moving and learning.