When you’re sitting at the harp, your feet should be able to comfortably move all the pedals. With your shoulders at their normal height, and your elbows out, forearms parallel to the floor, your hands should arrive at the mid-point of the strings without having to reach up or down. There should not be a lot of weight on your shoulder. If you have especially long legs or torso, you will have to experiment with how low you sit and how far away from the harp, but keep trying until you’re comfortable. Then measure how high your chair is and how far away you are! After finding the ideal set-up, you’d hate to lose it again!