Because the guest bedroom had the queen-size bed to use as a work surface, we assembled the furniture in there. We then discovered that the crib wouldn't fit out through the door. So we removed the door from that room, pulled the crib out, removed the door from the nursery, pushed the crib in, and then put both doors back on.
It could have been worse. We could have assembled them in the basement.
However, Gretchen says they look real nice.