Get your hands on 17 widgets, 23 widgets, 11 gizmos, and 42 widgets of various shapes and sizes. Don't forget the 1 widget wrench!
Sort your widgets into 3 piles: the ones that go together, the ones that don't, and the ones that will probably just get in the way.
Tighten the 5 bolts, attach the 3 widgets, and slap on the 1 widget wrench. If it looks like a mess, it's probably not done yet.
For more information, see Assembly Tips or Advanced Widget Assembly.