If you're making these for the holidays, you'll want to get as much done ahead of time as possible, but I think they always taste their best when made fresh. Peel and chop your potatoes the night before or in the morning, then cover them with cold water, pop a lid on your container, and stash them in the fridge until you're ready to cook. Be sure to drain that water off and start them in clean, cold water for cooking.