I did the Princess last year (not there this year, boo hoo LOL!)
We stayed at the Poly, and I was so excited I was on the first bus that took off! But that is my personality, I like to be early to things, running late gives me anxiety! LOL!!
So I got on the bus, it dropped us off on the farther side of the Epcot parking lot, and we walked to the staging area! I had bought into the Race Retreat so I hung out in there for a while, had breakfast, used port-o-potties, etc.
Then walking to the corrals is quite a feat- I was not anticipating the gridlock on the road walking to the corrals, and I was in corral B and made it just as corral A was taking off! So my only piece of advice, since you are both in early corrals, make sure you head out early enough to walk to the corrals because the road to get there is tight and it gets gridlocked and you are literally walking at a snail's pace!
But then once in your corral, life is awesome, and you get to start soon
Good luck and have a great race! Wish I were there too!!!