This is one of the reasons why being a manager is an amazing job. If you've ever worked retail, you know that dealing with irritating customers is par for the course. As a cashier, you'll spend your whole shift ringing people up, and a percentage of them are going to be crabby. So if you become a manager, you get to avoid the cash register more often than not. Along with a nice raise, it's a satisfying feeling to know that you only have to deal with customers when they're asking for a manager .…