* After you finish planning what you want to do, and after you have moved all of your personal items out of the way (maybe this isn't an issue if you never lived in the farm house), and before you tear down walls and make dust/chaos, remove all window and door hardware, and other small stuff (especially if you want to keep it) and put it in zip lock bags (labeled as to where they go).
Stuff like door stops and hinges and whatnot seem minor, but they can really add up ($$$) especially if you want them to even be somewhat historical.
* Here are some details that no book warned us about: - how high should the electrical outlets be.... if you have historically high baseboards, the standard outlet height will cause a problem - how high do you want your light switches.... again with the historical jazz, you may want to move it all higher - If getting dust in other parts of the house is an issue (i.e. you are living in a couple of rooms and working on a couple), then investing in those magnetic vent covers is a good idea, so that dust doesn't permeate the central air unit and throw dust where it doesn't belong. Nevertheless, cleaning the vents out thoroughly once you are done will save dust being thrown everywhere the first time you turn on the system. - If a regrigerator (or any appliance) is going to be living through the remodel, take care that you cover it, so that dust doesn't get in the motor, thus putting more strain on it.