I have poured the pineapple and brown sugar on in the beginning and been successful but for nighttime cooking I prefer to wait. The skin may look burned on some hams but it just peels right off and discard it anyway. Whether you cook overnight or during the day, make sure you keep the temperature low and let it cook 8-10 hours or else it won't come out that tender. We've never had a problem but always use your common sense and don't let any meat sit out too long. You may have to refrigerate the ham during the day while the kitchen is hot and cooking the turkey.
Nothing is worth taking a chance for letting any meat sit out too long and developing bacteria.
This ham is always juicy and falls off your fork. Turn down heat to simmer and add 1 cup of water or chicken or beef stock may be good, but I used water. Add sliced onions and pour 1 one pound bag of carrot babies over the top. Sprinkle with salt and pepper and a little more herbs and seasonongs. While cooking, I made sure steam was being produced and the chops were cooking, not just sitting in warm water.