Ideally, the only point of the first pull is to provide a little acceleration (a little) and mainly, to set up the second pull, where all the action happens. If you are scraping your shins, you are probably ripping it off the floor - a bodybuilder clean.
Try slowing down the first pull, and then when you get to a hang clean type height, concentrate on the second pull. I think usually, the first pull is not really used much more than for a 2nd pull setup unless the lifter is very advanced.