It is also good practice to fully read/look at and digest the instructions before starting the model, making notes as you go. The instructions cannot take into account every modellers methods and are there to show you where and how things go and not necessarily in what order. You need to make your own plan on how to build the model so care is needed to make sure that you understand how each part is designed to be fitted. So often to test fit parts, such as flaps, then wings can be taped together and the flaps offered up. Doing this would have highlighted the issue and you would have been able to go back to the instructions and see what was required.