number 1 rule: make sure your mind is all there so you cut things out to scale. instead of realizing, halfway through, that all those pieces looked wrong because you cut them twice as tall as they should have been.
...and then having to rip apart pieces of fome-core and board. thank goodness it's just elmer's glue.
rule 2: bring food. preferably gross health bars, since you'll be busy and more inclined to have a nice feeling in your stomach than a nice taste in your mouth, and the stuff is good for you anyway.