The mechanics of snatching can be very complex, however having the proper stance, grip, posture, and over all positioning consistently, will make it easier to have the proper technique. Its important to remember that although we can make generalizations about set up, everyone has a different body structure or build, so its important to account for that so full potential can be reached. Here is a great video running through some of the finer points of snatch set up.
Exercise: 12x1 High Hang Snatch Squat /1 snatch balance