There is a guy who does a pretty good job on a Youtube video, it's entitled something like "Takedown a Smith and Wesson 4506". Part 1 is field strip and reassembly, parts 2 and 3 are complete take down and reassembly. Should be the same for a 5906.
I think I've seen that youtube video. It was right on. At the end of the one I saw, he does the field strip and reassembly in like 10 seconds. That was pretty skillful.