I certainly wouldn't teach any kind of flying changes until you can get a solid simple change, through walk.
In the Dressage sense from that point, often the horse will be balanced and set up for the flying change, by preparing for the simple change. Then it's a matter of changing your weight and outside leg, allowing the change to happen.
Late changes (hind legs change after front legs) are frowned upon in most English disciplines, though we do not have hunters/jumpers here so I am unsure on the ruling there. Though from Cherie's posts it sounds as though late changes are pretty commonplace in those disciplines?
Posted via Mobile Device