Andy's got it right about practice. I just tied 250 flies for an ad agency here in town, each having a 4 section married wing, sort of similar to the Parmachene Belle but with one more section. Even though tying these was somewhat torturous, and took me forever, I can now set a married wing on a fly just the way I want to. I can make it lay level, cock it up, you name it. You just can't beat tying a lot of flies. Don Bastian is still figuring things out after the thousands he's tied over the years. That says it all.
Eric