The CD/video masters of the barebow, #3 is the latest and gets good reviews, covers many shooting styles.
Rick Welch CD/video for more of a high anchor short distance type aiming method.
I think you can find both on 3Rivers Archery web site.
I don't know what kind or weight bow your trying, but don't be afraid to go light bow weight, and try a single pin if your bow has sight bushings, if not, tape on something like a toothpick for a pin. It's just something to gain you some consistancy untill repetition takes over.