GET RID OF WHAT YOU DONT WANT

Moving is the best time to organize all your belongings.  This is when you can give away, donate, or have a yard sale to get rid of items that are no longer used and just taking up un-necessary space.  I would recommend starting this process as early as possible.  If you still have items boxed from your last move, its more than likely you will have them next time you move.

PACK BY ROOM

The best thing is to pack all items by room they belong to, you can label and order them in revers order with the first box #1 being the least used items and the higher numbers the most important to be unpacked first.  keep a list of all the items in your numbered boxes on a spreadsheet or you can label each box.