I just built my first kit. A Great Planes PT-40. I screwed the wing up while building it. I did not pay attention to the plans and got the dihedral wrong. I put the dihedral gage backward while measuring the dihedral. I was frustrated but I bought a wing kit and built it again. The mistake cost me 50$ but I learned a lesson to take my time and follow the plans. I probably could have fixed it instead of buying a new wing kit , but I am new and wanted everything to be perfect.