This is very close to what we call a "drive by" thread, posting a link with little or no explanation, and no questions or subject for discussion.
Why do you think your S&W needs this work?? Explaining that would be a good start.
Revolvers are simple machines, and many things look easy to do. And they are, but simple things are also easy to screw up.
putting in an oversize hand MAY fix a problem, but first, only if you have correctly identified the problem, and second, since oversize parts need some kind of fitting (filing, stoning, etc.) its then up to you to do just enough work, and not too much.
This is one of the reasons we pay gunsmiths for doing the work. Not just the cost of the part and their time, but also for their experience.
If you fit a replacement part, (according to UTube video instructions) and get something wrong, you're out the cost of the part, and your time, and you'll have to start over. If you have a gunsmith do it, and they screw it up, they're generally obligated to eat the cost of their mistakes. You're paying to get the gun fixed. Not just for buying and installing a given part.
Ex: say a smith screws up fitting the hand, 3 times, they can't (ethically) charge you for 3 hands, because the additional costs was their fault. (plus if they do screw it up, you need to find a better smith..
)
You probably can do the work well enough, its not rocket surgery and not a lot of brain science. BUT, if you do, its all on you. And, if there's any question of a warranty involved, you just violated it.
Good Luck!