5. Watch When You Ship
December is one of the busiest months for shipping companies, so make sure that you give your shipment enough time to get to your destination. FedEx advises shipping before December 17 if you choose the FedEx Ground option. FedEx Express air service can go as late as December 23, but I don't recommend risking it.
And here's a tip: pack your luggage in as small boxes as possible; large items are usually the first to be dumped if there is not enough space.