mkksmom tips are really good - make those priorities for yourself when you get out to tackle it.
If you have a good active craigslist or free cycle - I'm sure you can get a decent amount of free boxes from people who've recently moved (or like to collect boxes) - I know I see it on our a lot. Use your clothes/linens as packing material as much as possible - then you don't have to pack that on its own.
Not sure whether you also need moving help, and are able to pay for it - but I recently noticed our Uhaul has 'moving helpers' you can hire, for less than pro movers, if you simply need some assistance with carrying large/lots of things. You may find the same kind of help available near where you are.
Good luck, hope it goes as smoothly as it possibly can. I'm sure you'll work hard to do it well.
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