For a challenge Elaine, my micro-mechanics instructor gave me a tiny movement to get some practice dis and re-assembling. When you are viewing and working with the watch movement under magnification it's east to forget how small the parts are. It's also important not to squeeze too hard with the tweezers unless you want microscopic springs flying all over the place to be lost forever!
102050 movement pictured with razor for scale. You'll notice it's missing the regulator assembly because I may have accidentally destroyed the exceedingly delicate hairspring