Get this book: 'Production Fly Tying' by A.K. Best
Very enlightening. He put his kids through college tying flies.
I read it and can tie much faster now. Which means you can charge less and still make a good per hour rate.
He recommends tying dozens of the same fly at a time, you'll get better and faster as you get to know the pattern.
Lay out all your supplies before you start, as well as prepare them if necessary. It works.
Bill