We knew that the weather was going to be warm and that, combined with the chicks having grown out some feathers, meant that they would be okay without a heat lamp. It took four of us to carry the box, one on each side, and even so we had to stop and rest a few times. The chicks, inside, were chirping like mad. Another person walked with us carrying the chick's waterer and the bricks on which it sits.
The brooder box has been sitting in the hen house since then, getting used to the sights and sounds of life with the two hens and whatever other critters visit (squirrels tunnel into the area regularly). We wanted the hens to be bored with the whole idea of chicks before we let them loose.
We lifted the chicks out of the box, where they promptly huddled together in the corner.
A few hours later, the chicks were starting to spill out the door of the hen house into the run. They didn't venture far. The two hens were on patrol.
Periodically, one of the hens chased the chicks back inside and then ran around inside, squawking at them. As soon as she left, the chicks spilled back outside.
It seems to be going very well. And the chicks are endlessly entertaining.