I'm also naturally lefty, taught to be a righty, so I'm mixed handed, but, if the students need to switch hands, they'll have to take the glove off, put on a different glove and then carve? Doesn't encourage good technique... I got lazy last summer and stopped switching hands, now I got tendonitis so I gotta carve with the 'wrong' hand, my own stupid fault, but an important lesson in there somewhere