I would definitely get this taken care of before the start of classes. I just had to go through and deal with all of this earlier today, and I about had a heart attack. I remember them saying in the info sessions that you MUST be an in-state resident for tuition in order to be able to participate in the program because they will not pay out of state tuition reimbursement.
To make a long story short, I got a ton of incorrect info, but the overall answer is that you have to have been a resident starting by August 22, 2008 to qualify for in-state residency. You can bring in all your proof to any MCCD college to have them validate and change your info in the computer, and then just call whichever school you are attending and let them know that it was changed.
Good luck Looking forward to meeting you!