It takes a few sessions with a certified kettlebell instructor and enough practice on your own to get this movement right. (pathtofatloss.com)
I have had clients tell me the stuff they did with a previous kettlebell instructor and I'm surprised they ever decided to pick up a kettlebell again. (onnit.com)
If this is out of your reach, the next best thing is to get a good instructional DVD by a certified kettlebell instructor. (fitbodyhq.com)