Never be afraid to ask someone better than you for advice. No one, not even Shaun White, has learned everything there is to know about snowboarding. In fact, all the pros have trainers and coaches that they constantly ask advice from.
No matter how experienced you are, a lesson never goes astray, be it an hour, a day, or a full on two-week course. Bad habits can be rectified and sometimes it’s the kick up the arse you need to think about, and improve, your snowboarding.