Everybody's got something to offer, right? It could be a product you're trying to sell, a particular skill set you've developed, a certain you idea you have, or maybe something else entirely.

Part of the key to success is getting others to buy in and jump on board with what you're "selling"—so we asked a Hollywood actress, a New York entrepreneur, and a partnerships director at a San Francisco nonprofit what they've learned throughout their careers in getting others to buy in to their work.