USPS route setup: how do I organize my scanner and mail before heading out?

This happened to me recently while preparing a new postal route on a busy morning. The specific problem was mixing up packages, holds, and signatures until I discovered exceptions right at the customer's door. At first, it seemed like just another case, but in production or in front of the customer, those details get expensive very quickly. I didn't want to jump straight to a quick fix. Before…