It can't be said enough: throw it out if you don't absolutely need it or it's not a deeply personally valuable keepsake. If you think you need it, evaluate again and decide if you REALLY need it. If not, buh-bye.
Pack one to three boxes a night. It's easy. By the time you get to the moving date, most everything is packed up, and it only took about 30 minutes a night. Nice!
If you are moving yourself with the help of friends, be nice to your friends, and feed them/supply them with beer/frosty cold beverages of their choice during and after the move. It's never easy to move, and helping you out is a true sign of their friendship.
If you are hiring movers, congratulations, you just made the job so much easier, and you may never want to do it any other way. You pay for it (and it can be expensive), but if they're good movers who work quickly (and are honest -- there are some horror stories out there), it's terrific.
The day of/day before the move, buy/set aside a few little things you wouldn't necessarily remember to take or move or even think about for a new place until you're already there and it's a hassle to go and get: toilet paper, shower curtain, a few extra 60- or 75-watt bulbs, a surface cleaner, some sponges, cat litter if you have felines, a small supply of pet food and some easily accessible water bowls (old, clean margarine tubs can work, etc.), paper towels, that sort of thing. It's a pain to arrive at your lovely new abode, move all the boxes in, and realize you don't have any toilet paper, or it's packed away and you can't remember in which box.
Warrior Poet