One of the best ways to stick to the tough habits is to figure out what your real reason for doing them is. Why are you a sales person in the first place?

Don't simply use your desired commission, everybody wants that. Figure out a deeper seated why. Perhaps you want to make a mark on the universe before you leave it. Maybe you want your kids to have a better life. Perhaps you don't want to live with the regret of "what if...?". Maybe all of these and more.

Everyone likes pleasant activities. What separates the successful person is that he or she craves pleasant results. The real trick of sales is that it's full of unpleasant activities that lead to pleasant results.