A successful salary negotiation starts months before you ask your boss for a raise.
First, Sethi recommended scheduling a meeting with your boss to discuss how they are measuring your success at work, and what they expect from you.
During that meeting, you and your boss should jointly come up with a list of 2-3 actionable goals to get there.
When it comes time for your performance review, "Walk in [to the meeting] and say, 'Six months ago, here's what we talked about,'" Sethi said.
You should also research what other people in your position make and share those results with your boss, he said.