Always sit on a good chair with comfortable back support. Make sure your legs are flat on the floor, and do not sit with your knees to the side. Pull the chair towards the table, but leave enough space to freely move your body. This can prevent you from rounding back and help balance your shoulders.
Certain considerations shall be taken into account when choosing your nibs, including flexibility of the nib, ease of use, ease of purchase, costs and user friendliness.