You’ve just posted your best month’s sales figures ever. They’re even better than last month, which was even better than the one before that. You’re on top of the world. Flying. The boss loves you. The rest of the team...

“His palms are sweaty, knees weak, arms are heavy. There’s vomit on his sweater already, mom’s spaghetti.’ When Eminem wrote those famous lyrics he could easily have been describing the feeling you get when you’re about to do a big sales presentation....