If I had a dollar for each mistake I have made building a kit (RC, wooden ship or plastic) I could probably take a vacation to the Bahamas. - and have enough left over for some fine umbrella drinks ...
The main lesson I have learned from all this is to read through all the instructions to get an overview, then review the instructions for each step carefully (moreso if it's a manufacturer I am unfamiliar with) dry fit and look where each part fits into the assembly and where the assembly fits into the model and confirm what I have in mind makes sense and matches the plans

... has saved my butt more than once...

While it takes more time, it saves it in the long run!
Cheers!
Jim