Ill try to tide you over until CCJ gets here. Snatch pulls are pulls from the snatch grip position. That is, you get set and start to snatch, but you keep your arms straight, and you dont flip the bar, or jump under it, you just raise it as high as you can up your torso, to about right under your belly button approximately, while exploding up on your toes. You can do regular snatch pulls like these, or you can pull them a little higher by slightly bending your elbows, almost like a partial upright row, and those are your high snatch pulls, they go up to about your sternum. Timing wise, you want to synchronize the pull with the toe raise so you hit the highest point at the same time for both motions. Other than that, start with the bar touching your shins, and keep it tight to the body throughout. There are two drives, when the barr is off the ground and about when it touches the upper thigh, but thats more detail than you need to get started. Its a great lift for speed, explosiveness, strength and flexibility, plus it works a lot of big muscles of the upper and lower body.