This has been killing me too, but I'm only completed two workouts trying to do it.
After the first I came home confused, wondering what the heck I was doing wrong. I figured out the first thing I was doing wrong was supporting the bar in front of my shoulders(not touching them at all).
During the second workout, I was still having issues...didn't feel like I could quite get my upper arm perpendicular to the floor. So, going back to the book, and reading AGAIN. I think the problem is that I'm trying to maintain a full grip on the bar when Lou clearly states not to do so and let the bar roll down on your fingers.
I'll let you know how tomorrows attempt goes...

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