AA lot of buyers aren’t organized enough to clean and paint before they move in, but it makes everything easier if you can swing it!
Try to get at least a thorough cleaning done before you move all your stuff in, and if you can, get all your painting done. It’s much easier to paint an empty room than a room packed with furniture.
Your new home might not have any window treatments; if not, they should be at the top of your list of things to purchase (you don’t want to give your new neighbors a bad first impression, after all).
Check to see if the house has horizontal and vertical blinds, and make sure you like the style. If not, make a list of all the windows that need treatments and the measurements of those windows so you have it handy at the hardware store or when you’re ordering online.