Howdy
Exactly what do you mean when you say "servicing"?
I taught myself to take a single action revolver apart about 50 years ago or so. Can almost do it blind folded these days.
Double action revolvers are a different story. Most do not need any servicing. About the only thing I like to do with a really old Smith is take it apart to flush out hardened old oil. Other than that, none of my double action revolvers need any "servicing".
Here is a good example, a 38 M&P that left the factory in the 1930s. It had a good bit of gunk inside, so I disassembled it to clean everything out, then lightly relubricated it.
I learned to take a Smith apart sitting next to an expert gunsmith. He took the time to show me how to do it. There was no such thing as you tube in those days.
Even so, I do keep my eyes open when taking a Smith apart, they are a bit more complicated than a single action revolver.
Notice I did not disassemble the cylinder assembly. There is really no need, and it is easy to bend or break something. The extractor star is a separate part, brazed to the rod. Too easy to damage the weld.
Smith and Wesson went from right hand extractor rod threads to left hand threads on most models around 1961. The reason was the direction of rotation of the cylinder could tend to loosen the rod over time. By changing to a left hand thread on the extractor rod the extractor rod tends to tighten itself as the cylinder rotates, rather than loosening.
This is when the Colt guys will start telling us Smiths rotate the wrong direction.
This is my set of gunsmith screwdrivers. Brownells Magna Tips.
I gave up on the Chapman screw drivers a long time ago. Brownells are guaranteed. If you manage to bend or break one they will send you a new one free of charge. Plus, look how many Brownells tips I have. One for every possible need. Not so with the Chapmans.
I don't shoot semi-autos enough to try to take them apart. I have sent the recoil spring plug flying across the room too many times. Perhaps if I did it more often I would get used to it and not need to stock so many replacements.