Step One: Wrap duct tape around the end of two PVC tubes to create knitting needle "buds." This ensures that the thick yarn will stay in place while you knit.
Step Two: Use the PVC pipes as knitting needles and follow the standard knitting process of knit one, pearl two. Birek recommends knitting 24 loops across for a large blanket.
Step Three: When you've finished, weave the end of the wool in and out of the last row of loops to "seal" the edges. Tie a loose knot and the weave should hold in place.