Same with salespeople. Now for the rest of us. But there are strategies and methods to the training process that will make it succeed. There also are basic criteria for the salesperson. Having never given the program before, I had to document some universal corporate and self-training rules based on my experience.
Training also is a personal responsibility.
Presented here are the rules for both sides. It's easier to train a smart person than an idiot. Hire smart people. Hire happy people. Sales training is not a birthright, it's an earned right.