It is possible to install the barrel without the headspace gauges by using an unfired case, but that is very shade-tree. You'll have to buy an action wrench and a barrel wrench, unless you want your action and barrel marked up by the pipe wrench and bench vise. Seriously, it will be cheaper in the long run to have a gunsmith do the work...you won't have to buy $100 worth of tools.
The big question - why did the other guy pull the old barrel? Was it because it no longer shoots, or because he wanted to try a different chambering? If the throat is shot out of the barrel it will need to be set back and rechambered if you want accuracy, something a gunsmith should do. But given it is a .222 it will probably be okay.
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