I do not want to give the impression that nothing the government does ever suits me. This old video from the Federal Law Enforcement Training Center is excellent. It explains and demonstrates the use of the double action revolver. Thanks to PublicResourceOrg for making it available on Youtube.
My ideas about guns were formed back in an era when it was widely assumed that all of one's sidearm needs were adequately met with a small revolver and a big one. The classic pairing of a pocket snubnose and a full sized belt revolver, of the same brand, made particular sense in that both guns worked the same way, so you did not have to remember to do anything differently when changing from one to the other. I still think a fellow is pretty well armed if he has a couple of good revolvers and knows how to use them.