It's been a few years since I had mine off for ceramic coating, but I recall it going pretty much as you describe, fit the cross-over, hang the fronts on the studs, loose fit the rear mount, and then the flanges. Don't forget to check for the port gaskets -- flat copper in the exhaust recesses. If they aren't there, you'll have to buy or make new ones. Hold loose gaskets in place with a dollop of heavy grease -- it will burn off once you are running.