Can I teach myself hand-painted jewelry design?

Self-study is not recommended unless your hand-drawing skills have reached the level of professional designers.

No matter which direction you design, you can't do without hand drawing. Hand-drawing is your skill and tool to express your design ideas. Of course, drawing jewelry design drawings does not mean that you become a jewelry designer. But if you can't master hand-painted jewelry, then you can't express your design works well, so hand-painted jewelry design is very important.

Secondly, if you are good at hand drawing, you will learn electric drawing faster. My friend studied hand-drawing and electric drawing together when studying here, but you'd better ask the relevant teachers about your situation and let the teachers analyze it before choosing how to learn.