Psyched UpBy: Daniel McGinn Closing the sale. Asking for a raise. Nailing the big presentation. Of the 2,000 hours you work every year, your success or failure is determined in the couple of dozen crucial hours when you need to bring your absolute best. Will you? The last few minutes before a major challenge can be terrifying. Ever wished you knew how to make sure you ace the make or break test, audition, or interview? We often feel the most powerless just