Fwiw, from as far as I got, it's a case of experimentation to find the sweet spots on your neck. It's difficult - at least it very much was for me for as far as I got. Try different positions on your neck, and if necessary experiment wrapping socks around the rope in the areas you expect your corrotid artery to be so you don't feel like you're being suffocated. Or instead of socks, use small sections of pipe insulation. Good luck