I've moved cross country 3 times now. It's not that bad. The key is to just get organized.
My first tip: Start packing now - I know it seems weird, but there are things that you won't use or can live without between now and then. Think about Xmas stuff, extra linens, dishes, etc.
Second, get a mover - the time of year will make it more expensive, but have someone give you a binding estimate. The good news is you're moving from NYC so you won't have that much stuff. They can store it for you for a week or more when it arrives, but it's going to take at least a week to get it to SD in the first place, so you can time it pretty well.
Third - If you can't find someone locally to take your wedding stuff down with them, ship it to SD. Find someone who can receive a couple of boxes in SD (a friend, the sister of a friend, anyone). If you run out of options, one of my best friend's mom and sister there and I am sure they'll sign for a couple of boxes for you. That way it's there, waiting and no worries.
Alyssa's idea about writing down the contents of EVERY box is a good one. I tend to number mine - and I know then that (a) all the boxes are there and ( I open the last box packed first - because it will have the stuff you need the most.
I'll offer help in any way I can - I'm here in NYC, too. So if you need a hand, count on mine.