It can be tempting to verbally floss to impress the ladies at the town bar, especially when you've relocated from the town with the varnish factory to the big city. Oh, you've got a job as an assistant—with benefits? We all need to hear about your 401(k), and right this second.

Check your ego at the door. Everyone walks a different path out of high school, and assuming that folks will be interested in the price difference between a Bud bottle in DUMBO versus this Rolling Rock here is going to get your ass ignored (or kicked).

Real confidence comes from knowing you're charming enough to not rely on your credentials and cash flow as conversation pieces. Keep the embossed business card in your pants.