You'll need a flat bladed screwdriver to remove the barrel band and get the action out of the stock. And a 5/32" (If I remember right) hex key to remove the barrel from the reciever. It helps to have a ball ended one, but it's not required. That's pretty much it - drop in the new barrel, replace the wedge, put it back in the stock (or a new one) and go shootin'! You probably want to push out the pins holding the trigger group to the reciever, (and remove the trigger group) just so they don't fall out and get lost.