Here's another great tip Nathaniel,

You would be amazed how easily pieces can get lost!

A good way to prevent that is this - When you open the box, lay the top of the box next to the bottom. Now, any time you need to look through the box for a part, you can take the parts out of one box and put them in the other.

So by doing it this way, you always know that the part you're looking for is either in one side of the box, or the other. (And not on the table, or under the workbench etc.)