I carded, and carded, and carded some more. In fact, having never carded an entire (pretty much - saved a few pieces for needle felting a cute long haired doggie) fleece before I was amazed at the volume of batts I could make! Here's a vid of the carder in action.
The best results are had by adding a small amount of fleece at a time. Once carded the batts are carefully removed. All told, I carded 15 huge batts! They made a Navajo Churro mountain, and when I laid them out on my 8 foot work table they carpeted it two layers deep. ")