I don't know if it is on a DVD or not because it is an old video that SA used to put out. It is called the Anatomy of a Trout Stream with Rick Haffle. I adhere to the religion that reading water and understanding where fish are and why is far more important to angling success than any other aspect of fishing. In the video he uses a big orange cement fish, I believe he calls Henry, and he places him in spots and explains why the fish would be there. Learn to read the currents, depth of water and obstructions that will influence the way the currents flow and you will become a better fisherman no matter what presentation you are using.
Reading water is the thing that most anglers are the least proficient at. I have a few hundred anglers a year step into my boat and a very small minority of them really have much understanding of reading the currents and how they need to control their line to present the fly properly to the fish. Explaining to them how different currents will affect their presentation is what the majority of my day usually consist of. Master the art of reading the currents and you will see drastic improvements in your fishing.
The second thing that makes you a better angler is to learn to fish close, especially with nymphs. Far to often the art of casting over rides the art of catching because let's face it, it feels really good to see your fly line sail through the air with a perfect cast. Keep the length of line you are fishing with short and you will catch more fish. Most trout, especially ones feeding below the surface will allow you to approach much closer than you might imagine. I like to keep my cast under 20 feet when I am nymphing because it allows for much better control of your drift and your hook sets can be made without to much effort.
These are the two things that I see anglers from all walks of life and experience make mistakes with on a daily basis. Good luck with your fishing and if you can get a hold of the video it will be very helpful.
