A proven method, which is superb, ( and i'd tried all the others!) is to be found at www.guitarprinciples.com
This guy's book got me using all the other 30 books I'd bought & never got the hang of.
I don't get commission from him! ! but he has a perfect method for right and left hand technique in most styles, if you have the patience to follow his instructions - they pay off. Clear and ergonomic, it develops accuracy which is one of the charms of the style.

Stefan Grossman is a great teacher / dvd lesson source too, I started by planting my pinky on the soundboard like him for accuracy, actually that's a bit limiting (and damps that posh guitar you just bought!) but do as Guitarprinciples says and you won't need to plant the pinky.
Also Earl Scruggs's book on banjo playing is a very good right hand trainer, it gives you a realistic view of how much repetition is needed to learn.
Repetition causes physical changes in your muscles & in the nerve and blood supply to your right hand, those changes don't happen by thinking & wishing, you just put in the hours.