When you get your copies, often they will be in separate stacks of all the same pages, instead of collated sets. Here is a method for collating in an organized manner.
1. First, arrange the pages into piles that form an assembly line. Clear the space of a table or a clean spot on the floor for this. Lay out your impostion guide in the same way to make sure they are all right side up and in the right order. Your center page should be on the right, center spread of pages facing up, then the next page out, and so on.
2. Place the stack of covers on the right of the order.
3. Pick up a center page, lay it on the next page, and pick one of those up, and then the next, until you pick up a cover on the bottom of your little pile.
4. Stack the complete pile horizontally and then stack the next one vertically to keep them separated and make picking up the piles for folding and binding easier.