Go to Smith and Wesson's website and request a manual. It's free.
The instruction manual from S&W that is provided with a gun is not a good reference for taking apart a 3rd gen pistol, especially if you want to go beyond the most basic form of disassembly called field stripping.
However... the 3rd gen pistol is not something to be messed around with unless you really know how the internal lockwork functions. It is one of the most complicated in terms of gun timing and relationship of parts.
Having said that... there are various videos on YouTube that are quite good for learning how to take down a 3rd generation S&W pistol.
You can also get information by joining one of the Smith & Wesson internet forums, the best one known, with the largest membership is smith-wessonforum.com
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