If you want to do some steps ahead of time then I recommend making the recipe up to the point of finishing the sauce. Instead of layering it in the pan, store the cooked noodles, sauce, and shredded cheeses in the refrigerator separately for up to 3 days. When you are ready to bake, heat up the sauce (add some milk if the sauce is too thick), stir in the noodles, and layer the macaroni.