Cerakote is easy. It is super thin but super durable. Just tape off areas you don't want coated, such as threads, and you won't have any issues. In fact, they have an action paint for the inside to make it more slick. I personally just paint the outside areas and leave internals alone. Also, you can buy an airbrush kit from them that cost $50.00 I believe. It is pretty slick.
The smooth nut wrench is from Midway. I bought the action wrench and nut wrenchs from them. I don't have or use a barrel vise, not needed so far.
I put the action in the action wrench and secure it to my bench in a vice. I then attach the nut wrench and thump it with a soft blow hammer. Once the nut is broke loose I unscrew the barrel from the action. The reason for this is that savage assemble the barrel etc and then finishes the rifle coating. There are usually a bunch of media beads in the threads under the nut. It is really easy to clean up once the barrel is off. Just don't get all crazy whacking the nut and trying to spin it forward.