Ed McGivern’s technique for shooting from the hip: Keeping your feet fixed in one spot, repeatedly draw and fire into a berm with no target, noting where the bullets impact in relation to your body position. Continue until you are making small groups in the dirt. Then when shooting at a target, stand so that the target is where your shots naturally impact. Probably not going to do well at 20 yards though; better for small room distances.
Evil Roy’s (Gene Pearcy) technique: Draw the gun up vertically to your sternum while bringing the barrel horizontal and apply your offhand grip while it’s close to your chest. Then push the gun forward, straight towards the target. Your eyes can take in the front sight and target at the same time. Experimentation will lead you to learn what your sight picture should be to hit the target when making this move. Break the shot as your arms approach full extension. With a single action revolver he can draw and hit in less than a second.