When sales managers gather after a long day at a national sales meeting, it is common for them to swap stories from the road and share recent experiences with customers. Inevitably, the conversation turns to the things they wish they would have known before moving up the ladder to become a sales manager. More often than not, strong sales performers are elevated to management without any preparation or training. As a result, a new sales manager must learn on the job. Here are five things many sales managers wish they would have known before joining the ranks of leadership.