Want to add a separate heat zone

[Ramanonos]

This looks pretty easy, but unsure. I have a several forced hot water heat zones, one of which covers dining room and family room. I want to separate rooms with separate zones. The good news is that I’m already plumbed/capped with several idle zones. See picture. how difficult would this be to do myself, who has no plumbing experience. How big of a job with this before a plumber to do?
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