I'll by no means an expert. But I've been shooting a switch barrel rifle since 1996. I got my second benchrest rifle w/ 2 extra barrels last fall. Here's the way I do it.
I clamp the barrel in a good barrel vise with a paper wrap between the barrel and vise. Usually a paper towel roll or a cut up old file folder. After removing the present barrel, I wrap the threaded end and put it in a barrel bag. (Home made, my wife used to like to sew.) I clean the internal threads of the receiver with chemical naptha, or regular lighter fluid. Make sure you clean the face of the receiver where the barrel will lock up, and the mating area of the barrel. After checking the new barrel for burrs and dirt on the threads, I apply a small amount of anti sieze compound to the end few threads. (A spot about the size of a green pea.) I use the FelPro / LocTite brand C5-A copper based formula. After screwing the barrel back into the receiver up to just bump the stop. Then I place the receiver wrench into the action and give it a healthy smack with a large dead blow hammer. But not too hard. If I had action wrenches that were the rear entry type that a torque wrench would fit. I would probably have a more precise way to tighten the barrel.
I hope this helps.
[ 06-20-2004: Message edited by: Victor N TN ]