It depends on what you’re changing your mind about. If you decide to leave behind the piano, it’s not a big deal and you can end up saving money. However, if you decide to bring a piano, it can lead to issues as the moving truck might not have the necessary space for such a large instrument. You should let the movers know at least a few days in advance if you do plan on bringing a large, bulky item so they can bring the appropriate tools and truck.