Most difficult thing to get used to with your Prius

I drive a 1997 Ford F-150 4x4 right now as an every day vehicle. It is also a pain to calculate the distance in front while parking. I ordered a Prius about two weeks ago and I can't wait to start saving money on gas. I don't care about waiting for 2006 for the better tax break, the sooner I get this vehicle I'll start saving money. Right now I'm driving 140 miles round trip and it is BRUTAL.
The dealer said I shouldn't have to wait more than six weeks, BUT, she also said I might have to wait for a 2006 model. PLEASE GOD don't let me wait that long.