I really like Greg's book and Glenn Pendlay's progression.
Keep in mind the following two positions:
1) Power position:
If you can get to and explode from this position every time, you've got 80-90% of the battle won:
2) Below the knee position.
If you can consistently hit this position with the back set correctly, weight on the heels, ready to bring the bar in to the hips, you've got 70% of the battle won.
(look at his back and chest here)
by Rob Macklem
, on Flickr
90% of the art of weightlifting is getting the bar from the floor to that below the knee position, and then from that position to the power position, and getting good "body feel" is critical.
Check yourself with a video camera (if you have an iPhone 4, the VideoPix app helps provide instant feedback). Post video to this board and to Glenn's board to get feedback.
Here's what finally worked for me (despite coaching, because I'm a slow learner):
Glenn's progression starts from the top, which makes it easier to hit those positions, but ultimately you need to hit them consistently from the floor. A good drill is to start from the top, hit the power position, hinge your hips to the knee position, bend your kneed to the floor, and reverse the steps back to the top, over and over. Start with PVC until you have it down. Then do the drill top to floor and then floor to top, pause, and do a full snatch from power position. Start first with PVC until you have it down cold, then go to the bar. If you purchased an Eleiko set, a pair of training plates would be a nice incremental investment so you can start from the floor consistently from the right place.
The weights will be silly light and the whole thing will be frustrating, but hitting those two positions consistently every time is pretty critical.
Progressions and drills:
This is a good drill prior to the step of the progression where you snatch from the power position: