I'm not very seasoned but I can tell you what I did with my first successful broody. I have no other place for a hen to brood but in the coop. It is very much a predator proof coop - that means no snakes or other critters getting in at night to steal chicks or eggs.
I moved my broody, nest and all, to a very large dog kennel within the coop at night. After she was good and settled I started leaving the door of the kennel open and just checked once a day to make sure the other hens hadn't added any eggs to her clutch. I put food and a chick waterer in with her. A few days before she was due to hatch I locked the door to the kennel.
By the time the chicks she hatched were three days old Mama made it very clear to me that she was ready to bring her chicks out to meet the rest of the flock, so I let her. I left the door to the crate open during the day, but locked it at night after she and her babies had returned to the nest. After about a week or so I started leaving the door open full-time, night and day.
The chicks are now 6 weeks old, none sleep in the nest anymore. They have easily blended in with the flock. Mama doesn't mother them anymore, but my rooster keeps a close eye on them when they are out with the rest of the flock.
I have another broody in that coop, in a regular nestbox. She's on day 5. Sometime this coming week I will move her to the dog kennel and start the whole process over again.