Have a Great Time! I came to Skippy "late" too (64-ish as I retired from USAF), but learned a lot - and there is a wealth of info here and some good folks too. After your 3 day - you'll have a better idea of your AX and PDX opportunities I bet. The 3 day starts with a little AX to warm you up and get used to the cars.
You'll be familiar with "skidding" sideways from the hydros and that will be useful if Atlanta gets wet.
Any words on you instructors? Be sure and get the shotgun seat if you can on the ride around. After 3 days - I'll bet you'll be looking for a 2 day advanced next!
Take "small bites" and as they all say "Keep your eyes up."
Cheers - Jim