Two tips that worked for me.
Polish the hardware store bolts in a drill press with sandpaper till smooth and clean. Lube them well.
Pre fit the temp bolts in the wing before attempting to fit it to the RV. It should slide smoothly into both sides of each wing (Wing spar side and fuselage center section side side) before you start. That way you know the bolts are a smooth fit through all the assembly holes, without the alignment issue.
Good Luck and proceed slowly, without major force being involved.
As Bill Stout (designer of the Ford Trimotor) used to say, “Simplicate and add Lightness”