To make a pinch pot you must make a ball of clay and make a hole on the top of it, not all the way through it. Then you start to pinch around the ball with your thumb in the hole, thats why its called pinch pot because you pinch it from the inside out. To make a successful pinch pot you must make sure that you piece is a even thickness through out the entire piece. You also want to make sure to pick up your pinch pot on both sides so that it doesnt shift and bend and crack because of clay memory. The final rules to makeing a successful pot is to take your time, because its not a race to finish.