But there are so many moving parts to Spey casting. Form a "D" loop… watch the "white mouse," Skagit style.. Scandi style. It's all enough to make you crazy. I fell for two-handers about 10 years ago (I'm a Skagit style angler) and though I am obsessed with it, I only get out and really pound these casts three or four times a year. In other words, I take two steps forward, and one back. If you want to get into the details of Spey, buy Simon Gawesworth's "Spey Casting." But if you want to dabble, or learn the basics, or keep yourself on a path of competence, you don't need to confuse yourself with so many details.