In addition to labeling what's in your boxes, add what room they'll be going into, as well.
Keep sandwich bags handy for holding any small parts of things you have to take apart, like curtain rods or mounted flat-screen TVs.
Take a photo of how your electronics are connected so you can remember how and where all the wires go.
If you're renting, take photos of your cleaned-out old home and your new home before moving in.
Arrange for a charity organization to come pick up the items you don't want at least a week or two before moving.
If you own items that you want to get rid of but are too valuable to just give away, start selling on eBay, Etsy, or Craigslist at least six weeks before moving.
Remember to defrost your refrigerator at least a day before moving and wipe up any liquid.