Doing your own job is tiring enough without having to do your coworker's job too. Unfortunately, the reality is you'll often find yourselves having to make up for your coworker's chain-dragging—hey, at least those group projects in school prepared us for something … right? Another unfortunate reality comes in the realization that most managers will be slow to do anything about this. Even if they say they're looking into it, you can bet on a sloth to show more urgency and keep a greater pace. No…