Sams right, I've seen a number of guns ruined by improper barrel work. I still occasionaly see articles telling people to "Carve some blocks of wood to fit the barrel, lock the barrel and blocks into a vise, stick a hammer handle through the frame window, and 'twist'er off".
To rebarrel a revolver takes custom made barrel blocks, (either aluminum or nylon), and an action wrench with inserts for that particular gun. Then there are throating cutters and gauges, and barrel facing cutters.
If you're willing to put up the money to buy the proper tooling, and get some training, you can do it. Otherwise, I've seen some very expensive paper weights that used to be S&W's and Colt's.