No, just lay on your back and look up. Driver side it's above/between the evap (?) thing and the plastic fender well. On the pass side, you'll have to reach past the exhaust behind the plastic fender well to get to it. YOu can see it with a flashlight and once you see it, you'll know exactly what I mean.

From the outside of the vehicle, the nut is behind (inside) where the plastic bumper and metal quarter panel come together at the fender well. Am I making any sense?