Please don't take this the wrong way, but why do you want to? It is not easy even with the tool and there is usually no reason to do so unless something is broken and a good chance that something will be if you have no experience.
I wanted to clean the area on the yoke where the cylinder turns.The cylinder seems not to turn as freely as it used to in the past. I have cleaned my Smith & Wesson revolvers with good results when the cylinder-yoke junction became dirty. How can I remedy the dirt problem without disassembling those parts? Thanks. Doc
Jim is correct. This requires a special tool and if you don't know just what you're doing, well...
Shoot some Gun Scrubber into it or soak it in good solvent for a while. If that doesn't fix it, I'd suggest a trip to a gunsmith.