I think that doing it off a small jump, cat track, etc would be a god place to start. I would not call it a butter, more of a kick. Think of it like a soccer throw-in. Arms straight and extended, get thrown from head to hips while you bring your foot forward an kick it back in the same motion. Go into the tuck and hold it until you come around. If you want to do it over a bigger jump, where you actually take of correctly, spot your landing, and have control. Start with moose ears, hands near ears, on take off, dive out over the jump hands straight out, spot landing, tuck it in and extend on the landing. I have heard of people freeking out when diving out, or just doing a 3/4, when trying it this way for the first couple of times. Thus I would recommend the first one to try first.