Before you bugger up a good gun, I suggest you go to a competent gunsmith. I have seen Larry Crow's video on tuning the Ruger Vaquero and he covers barrel removal...Now, I'm real danged handy, having built golf clubs, fishing rods, and even airplanes but after viewing his video, I wouldn't try it without the proper tools.
Brownells sells barrel vises and the proper frame wrenches but unless you're goin into the 'smithing biz the prices are more than a gunsmith would charge for several guns.
just MHO...'n my 2 cents worth