Spinning wool is a bit different from spinning deer hair. One thing it won't flare like deer hair. Two ways to approach it. One is to put a clump of wool on the top of the shank and one on the bottom, make a couple of loose wraps and then tighten. The wool should spin on the shank but won't flare you can tease it with your fingers as you're tightening the thread, or wait till the you've filled the shank then tease it out before you start to trim. Second way, and this is the one I use is to slide a clump of wool/fleece down the hook shank and make the wraps to tightend the wool, then you bring the thread in front of the wool and push it back. The first clump you tie in you trim the front even leaving the back tapered, the rest of the clumps are trimmed even front and back. Like deer hair you keep packing it on the shank. Once its packed you trim it to shape with scissors. You won't be able to use a razor.