I need to replace a kitchen faucet spout. It is a Peerless two-handle. I have the new spout. What other parts will I need and exactly how does this thing come apart to just replace the spout?

I need to replace a kitchen faucet spout. It is a Peerless two-handle. I have the new spout. What other parts will I need and exactly how does this thing come apart to just repalce the spout?
I'm putting up a i9mage of a two handled deck faucet. See that knurled nut at the base of the spout? That's the nut that retains the spout. Unscrew it pull the spout up. You will find "O" rings down there. If you have a leak under the new spout pull it and replace the "O" rings. Good luck, Tom

The one I have is different then that. I unscrewed that piece around the bottom of the spout and removed the nut under the spout on the underside of the sink mount and it still won't release.