Sorry! Missed most of the replies.
I've been tying for a couple of years and the two techniques with which I have the hardest time getting acceptable results are spinning hair for muddlers, and layering materials - actually on controlling the head size when I layering several materials. There are others where I don't think I'm doing a good job but these two have produced more revolting flies than any others.
The problem(s) I'm trying to overcome are technique-related, not with someone's favorite pattern. I've tied (and then recycled) scores of flies I didn't plan to use to learn how to tie them. I'd be happy to watch someone tying flies, but down here I'm hours away from a fly shop or a club, and I'm the guy folks snicker at because I use a fly rod (and that's why you folks put up with me).
I've heard that either volume by Kaufman is a good reference, thanks for another recommendation.
I watched Bob Clouser tie years ago - and I'm a champ with Clousers - and without his instructions, I'd never have figured out how to pinch hair into a tight oval. I've picked up some good hints from videos by Davey McPhail and SMHAEN, and Scott's and Silverfly's posts here have been a great help, but I have a lot of gaps in what I know.
I used Kelly Galloup's tutorial on vises when I was shopping for a rotary and now I'll go check out his tying videos. Thank you.
I also haven't watched any of Hans Weilenmann's tutorials but will search them out. Thanks, Scott.
I hope to invent a unique and successful salmon fly that I can name the Damned Fly, so when one of the gear guys around me asks what I used to catch that big king, I can say "Just a Damned Fly."
Thanks all. I apologize for leaving this hanging.