Is it worth it???

I do both wehn I do them. I think for sake of safety, have him build and run it/break in the new engine. But once that's done, you can install it easy enough. Expect to pay for the break in services and extra materials (oil, filters, etc). But I think for most average guys this is the best way. It's also why I built a run in stand. Because when a guy doesnt pre-oil, or has an ignition issue, or doesnt have the tools to install the inner valve springs... It always seems to be the shop's or cam maker's fault when the cam goes flat. Many places now won't warranty it unless they fire and break it in too.