Now that I've gotten the crude innuendo's out of the way I'll be introducing the method I use to show people how to snatch a kettlebell.
There is something about throwing a weight overhead (probably fear) that makes people freeze up and lose the snatch.
Here is a simple method for getting used to moving a heavy weight overhead and fixing it in place.
1 handed swings. This works on getting the height and speed needed to send the bell overhead.
2 handed snatch pulls. A snatch pull is performed by deadlifting the kettlebell and explosively pulling it straight up. There should be little or no backswing and the hands should be holding the kettlebells by the "corners" of the handle. This works the path an efficient snatch will take and kick starts the dead snatch (one with no backswing)
Overhead holds. The endpoint of a snatch is holding a kettlebell overhead. If you're not confident doing this, you'll lose the exercise. Press or jerk a kettlebell overhead and hold it in place. Work on maximal tension at lock out.
There you have it. The LKB guide to working up to snatching kettlebells.
