Heres a link to the tech articles section:

http://savageshooters.com/index.php?articleview=Savage Barrel Swapping

The guy here uses a sized case as his "go" gauge and the same case with paper shims(u can also use scotch tape) as his"nogo" gauge. This works fine if you are familiar with what youre doing, but for a first timer i would recommend buying a set of GO and NOGO gauges for each caliber you have.

You can get the barrel nut wrench and the barrel blocks from Sharpshooter Supply, or you can get a barrel nut wrench, an action wrench, and the gauges from MidwayUSA.

Safety is first, so if you get in the middle of it and are questioning something either have somebody come and help you out, or maybe one of us could talk you thru it over the phone.