Personally, I think this is a job for the pros.

To replace the boards are easy enough if you are mindful to protect surrounding boards from damage during the removal and reinstallation/repair process, but have you given any thought to snading and refinishing to feather in the repair into existing, or a full refinishing that may be needed if you are not able to feather it into existing so it looks right ?

There is certainly no guarantee that a pro would fare any better, but I think a pro would have a much better chance of success from their experience.

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it all needs refinishing anyway. and I can find reclaimed hardwood of the same type and age etc.

mainly I was wondering about the talent and skill required to do the hammering and replacing and still have it all look good.