When packing keep related boxes together so they will end up in the same room in your new home. This will cut the carrying time and make the move more efficient.
When packing don't tape your boxes closed until you're about to go, so you can add items as you see fit. More information on relocation tool here.
When packing be sure that every box is clearly labeled by room and item.
When packing it is important to label each box carefully, with respect to the contents and its destination in the new home.
