I very rarely see a breaker trip, and when it does usually there is a construction reason, like a compressor plugged in a 15amp circuit. If the house has heat that will get used, meaning there wont be space heaters plugged in to multiple rooms, you should have two bedrooms to one breaker. wire everything in rooms to this breaker, lights, plugs, and smoke detector. Dont forget to put it on an arc fault breaker. Then you will have one room left to put on one breaker. Do this with the one room you think most likely to be used as a home office some day. This method is how I wire homes and I do do this all day every day, good luck, and dont be afraid to pick off a hall light and a bathroom light on that rooms power as well.