Be mentally tough and disciplined
Gain skills and keep adding skills
Work hard and smart
Do whatever it takes to be successful.
Sales requires the same. The difference is that sales will make you rich, if you apply the above.
As a band director, you’re already in sales. You sell the program all the time to students, parents, admin, and the community. The difference is your pay. You’re a salaried sales person - no commissions or bonuses for being successful.