Working with a knife on meat or wood requires a lot of awareness to the curves and the softer vs. denser parts of the tissue. Both materials come from living tissue and are good examples for working on people as well. It is sometimes easy to work with exceptional tools like a scalpel for meat or a special wood carving knife but you can learn a lot more about becoming aware and relaxed by working with a simple and not too sharp a blade. For example you will learn to hold a handle that is not perfect for your hand in a better grip and change it according to the task and learn to feel where to cut and how and in a relaxed manner because if you try to muscle through resistance you can break a bone or the piece of wood and even injure yourself. Give yourself time to learn.