Negotiating is like a muscle. You're gonna want to work on it before the moments that really matter. Easiest way might be to start going to flea markets, because those azn grandmas are killers that make Shark Tank look like the kiddie pool.

That'll help the soft skills, but in a hiring situation, the other part is getting to what the other side really wants and what their concerns are. A hiring manager's first thoughts are: "how much babysitting is this person going to take?" and "will s/he mess up team mojo?" Don't be that person, be the net go-giver that makes 'em shine... Less talk, more walk.