It usually takes a few years for the smart ones to realize the following...(assuming full time)
1. The numbers are their problem, not yours. This one is key! I once told a supe, "once your paperwork can deliver boxes, we'll talk numbers." The End.
2. As they said on The King of Queens, "I drive boxes around Queens." It's fairly basic work for good pay and good bennies.
3. If you do everything by the methods, you'll be going waaaay slower, have job protection, and make more money to boot. Treat it as if you were taking a leisurely walk every day, or your workout session.
4. Realize, succumb, capitulate, whatever... to the idea that during the five days you work, you will be unavailable for other things. In return, you make sure you take them to the cleaners. You're stuck there virtually indefinitely, make it worth your while, all while making it hurt their numbers in return!
5. Never be afraid to file a grievance. It used to pain me to see people afraid to file. UPS supes are just looking to give away free money.
6. Take all entitled break time, no exceptions.
7. Biggest motivator of all...some day, they'll be paying you to take a permanent vacation, like me. Three years next month!