Don't be so hard on yourself! You have a GoPiGo2 and you built it. That means you're smart!
If you look at the slot where the screws are supposed to go in, one end is wider than the other. I put my first screw in there, and then I slide it down where the slot is thinner. I don't have a lot of strength in my wrist so I'm having trouble with those screws too.