For the barrel swap, you need the action wrench, barrel nut wrench, barrel vise or at least, blocks for the barrel to put in your bench vise. Go gauge required, there is no need for a no-go gauge on a new re-barrel.
For best accuracy, you should replace the factory recoil lug with a precision ground lug like that from Holland, as well as a squared and trued barrel nut.
I do them for $125...and can source anyone's prefit barrels.
PM me if interested or if I can be of help.