Your skis take a serious beating over a full season — six days a week on everything from groomed corduroy to icy moguls. At minimum, get a full service (edge sharpen and base wax) every 10-15 days of skiing. Sharp edges matter more for instructors than for regular skiers because you’re demonstrating technique repeatedly and need your skis to respond predictably. A dull edge on hard pack in front of a group of students is not the look. Most resorts have a cheap and fast tuning service — use it regularly rather than waiting until your skis feel terrible. Learn the basics yourself too: a quick touch-up with a pocket stone costs nothing and keeps your edges sharp between full services.