I hate wood as a building material, but here is the best tip of all.
Use a saws all saw with a Milwaukee metal cutting blade to cut the nails.
DO NOT try to pry them apart, use a hammer, ect. You will just break the boards into small pieces of fire starting wood.
After the nails are cut, and the boards are apart, you can use a nail claw to carefully remove the nail stubs from the boards so your able to sand them, ect without wrecking all your tools.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization