Building all from scratch, i.e. part by part is very difficult. However, there are watch building clubs that provide access to kits and all parts that allow you to build a watch of your own.

What is a quartz watch movement? A quartz watch movement uses a battery as its primary power source. It's the force behind the dial that drives the hands and powers all complications. The battery sends an electrical current through a small quartz crystal, which electrifies it and creates vibrations.