This video covers sizing of pin and collar bracelets;

Such as the Calamity bracelet - if the collar is a little loose, you can very gently tap/crimp the center of it with some toenail clippers.

This video covers screw pin bracelets, I recommend it for all watch enthusiasts.

This video outlines the proper practices for sizing an Orion 1 / Field Standard / Sylph bracelet. While it may seem intuitive, some steps outlined here will prevent screws from coming loose. 

Below is the removal and installation of hands.

A little more advanced than sizing a screw pin bracelet, this video demonstrates how to uninstall and install watch hands.

An introduction to the principles of timing your watch.

Proper technique for using springbar tweezers, which make high tolerance bracelet installation and removal a breeze.