Are you staying onsite or offsite??
Oct 3 is EE morning so the park opens at 8:00a for onsite guests. For offsite guests, it opens at 9:00.
If you are staying onsite I'd arrive at 8:00a and do some rides before my PS. If you are staying offsite, I'd arrive right at 9:00a and maybe do a ride in Fantasyland before your PS. I'd arrive at the reataurant no later than 9:30a.
I'm not sure if they'd let an offsite person in at 8:00a for a 9:45a PS?? If that is what you are asking...