Do a search on the forum for barrel swapping. You'll be reading for a while but the end result is you'll be so smart, you won't be able to stand yourself.
Some guys like to take the ejector pin & spring out when they headspace. Personally, I don't. It's never caused me any trouble.

Look for a new or good used action wrench & a Savage barrel nut wrench. I think SharpShooterSupply has quality stuff at a decent price. And read. Read a few threads from the forum & after your first swap, you too will be a genuine Savage Addict. You'll be required to attend Savage Addicts Anonymous twice weekly.
Have fun & don't forget to double check your work.
Frank in Fla