1. Do whatever you feel is proper for break-in. Some guys get religious with an overly detailed and specific technique, others do nothing but shoot the crap out of it. There is no right or wrong here, just whatever sets your mind at ease. No method has ever been proven to be better or worse than the other.
2. No - most guys only change the recoil lug if/when they decide to swap the barrel for another one.
3. Ignore your friend, he cleary doesn't know what he's talking about. Barrels are headspaced at the factory to SAAMI spec. The only time you need to check or reset the headspace is if/when you remove the barrel from the action.
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