My dad used to say "ah, the joys of motoring"

Don't let it get you down buddy, just re frame it in your mind that you are learning as you go.

I sometimes find that not slogging away all day is the solution, going back at it the next day seems to help, especially if you can squirt the area in wd40 to let it soak.

Also, you may find that you can get to it from underneath if you jack up the car.

Yesterday I found a lose engine mount on my car and instead of struggling to get at the bolts I took off the turbo and exhaust manifold to get to it, longer job but made the engine mount a doddle.