[header] How to get your coworker to stop telling you how to do your job [title] Stay calm. [step] It can be frustrating and upsetting when someone tries to take over something you know you are fully capable of completing. If you're feeling annoyed or angry, try to keep your cool. 
Don't do or say anything you might regret or that might make you look foolish at the workplace. [substeps] If you need a moment, walk away or take some deep breaths.