Here’s 2 good examples of Stacking vs spinning. Both are tied with 100d GSP. The better the vise, the better you can spin&stack. Belly hair as capt mentioned earlier does spin easier. Being more hollow it flairs better and allows you to compress it better. Buy a big pack of razors off amazon or if you use an old murker open comb(as I do), just use the blades that are too dull for your face. Just takes time and practice. There are some artist when it comes to deer hair, I’m not one of them. I try to keep things simple. So don’t try to make a 10colored frog. Just start with simple single color patterns and work up from there. Be careful though, you’re already falling down the rabbit hole....