Sorry if this has been asked a lot but I've been playing guitar for a bit over a year now and I've been holding the pick between thumb and index finger. Coming up at school is our music performance where me and some other people are going to play Master of Puppets. I have heard that Hetfield plays using thumb, index and middle finger on the pick. I have tried doing this and it makes the riffs decidedly a lot easier and i can play it a lot faster. I was wondering if this is a good technique or if i should just practice more and more with using just the thumb and index finger. How do you hold your pick?