urethane floor finish room-by-room

Hello,
I have three adjacent rooms that share a hallway that are wood-floored and I would like to re-finish. Due to constraints of time and amount of furniture that would be difficult to remove from the area, I would just like to do each room separately. But I am a bit concerned that there might be difficulties with the applying the urethane (water-based) finish such that this "strategy" is not obvious when all the rooms are finished. The only area of concern is a doorway, so it isn't big, but still interested in any pointers or gotchas I should be aware of.
I assumed this issues be similar to reparing a urethane-coated wood floor, but wasn't able to find to much that was helpful on this.
Thanks in advance for any help/pointers.
--Dan
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