You will need deer hair (not bucktail) or some other thicker, hollow hair. It is actually the compression of the hollow space in the hair that makes it flair as is desired in spinning and stacking. Start there, use heavier thread (at least 6/0, but 3/0 I think is better for learning), and pull hard enough to just avoid cutting the hair. Then pack away. Just don't push hard enough or off line from the hook to bend it. A few wraps of thread in front of each clump and keep practicing.