Like Andy said, documentation, documentation, documentation.

Having to go back and change one thing to accommodate another in final assembly, and not recording it can cause real headaches.


I am personally too often guilty of it. Mostly because of the overwhelming amount of time it take to finish an assembly. Together, and apart countless times, even when there really aren't huge obstacles. Do a combo with lots of interference issues and it's even harder to take the time to record it all.