God, what a gorgeous house, lurkette! I'm insanely jealous.
As someone who's moved a few times in her life in more complicated situations (both times our house wouldn't sell right away and we had to move into rental homes while waiting for the house to sell so my dad could start work) you've gotten quite lucky. But every time that has happened to us the place we originally wanted slipped through our fingers--and a better place has cropped up when our house finally sells. You're fortunate that everything is going right, and that new house looks beautiful.
Just stay calm, rent a U-Haul, get your friends and neighbors to help you pack the truck, and you'll be fine. We've moved houses full (9 years of accumulated junk between 4 people the first time, 20 years the second time) multiple times with a U-Haul, and provided you have assistance on both ends, it's really quite easy and much, much cheaper than hiring someone. Of course, we had it easy--my dad, being the high school principal, always just got the football team to help us pack and unpack.
Offer them pizza and beer in gratitude, and you'll be set.
EDIT: Oh, and lurkette, don't worry about the new house being more expensive--that means you're tying up more of your money in a good investment. My parents have always taken the money from the sale of the old house and put it into a new one--they started off in a house that cost $100,000 in 1986 and sold it for $194,000 in 1995. Then in 1995 they bought a house for $196,000 (they wanted 200,000 but my daddy is a wheeler-dealer) and sold it for $220,000. Now they're in a house they paid $300,000 for two years ago, and already the value has increased up to $450,000 (this is what happens when you buy waterfront in the Puget Sound). But my dad says the heftier house payment is worth it to have such a great investment on his hands.