how you hold the pick is key....I\'ve always been able to do them, but I may have 2 major differences with most guitarists. First, I hold my pick with my thumb and middle finger, which I guess most instructors would slap you for. Second, I have weird thumbs. They "hyper extend" or something, in that they curve backward when fully extended. For that reason, the inside of my thumb knuckle is always in place to hit the AH. Also, where your pick hand is in relation to the bridge is important. Experiment moving your pick hand around.