Frustrating, annoying....oh yeah always when rushing. This is just the reason Harry. Stop thinking about " a race " , start thinking about models. Try to make it using step by step method. For instance Monday - seat belts, Tuesday - a pilot's seat etc.... you don't have to spend all day long on that. One hour is enough. If you would finish in a hal of an hour you could start the next step for the next day planned. Certainly no rush for that. The rule " check three times, glue once" is still the most important one.