The so called swing draw style of shooting, isn't a style ,it's just a way of practicing.
It's actually not that hard to do.. All you have to do is practice it in stages.
Like any other way you shoot your bow..Usually you address the target with your feet perpendicular,
12 o'clock to the target every time you shoot. To shoot
the way I mentioned, all you have to do is plant your feet at 2 o'clock and shoot from there.
Then 4 o'clock, until you get around so your not facing the target.
The same goes for shooting with your feet Parallel "facing" the target. Do it in stages until
you've reached the position you're looking for...
Doing it in stages makes it a bit easier to get used to it.