To build fittings for bowed string instruments (commonly defined as "sets" of pegs, tailpieces, chinrests, and endbuttons), very compact woods are used, capable of withstanding wear and stress.
When working with wood, we often rely on steel tools. Some of these usually need to be purchased (for example plane blades and gouges) as they are complex to make. Other types of tools, however, can be produced independently.
Sharpening cutting tools is a fundamental operation. It may seem paradoxical, but a sharper tool is actually "less dangerous" than one that cuts poorly.