Though I learned from my good friend Jack Lin years ago, I thought this guy's illustration is very good:
Video downloaded and archived.
I began using my 6" reflector a couple weeks ago, so exciting to do this in the NJ home. Light pollution is slightly lower than NYC. It's been years since I touched my Celestron. Much to learn! Dad will come in a September, hope to share this experience with him.
For DA motor installation (Dual Axis Drive for CG-4 Mount):
https://www.youtube.com/watch?v=TXvmR_HXAw8