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My neighbor tried this with urban store chicks that were 1 week old and kept sticking them under her broody and she finally came out to 3 of the 5 dead.
Week old chicks are a little bit too old to try it with IMO. Obviously you have to stick around and observe the hen's behavior to...
Twice I have removed eggs that weren't going to hatch from under a broody hen and replaced with days old chicks.
I made the switch late at night, when the hen was sleeping. Both times all went well. I wouldn't attempt it with chicks that are more than 3 or 4 days old though.