We park and tailgate against the JTS fence in S1, we got to the stadium around 10 till 7. There was still plenty of parking in the S1 lot until 9:00 or so. The best way to enter the stadium for the handicapped lot is from the West. As you drive off the street, there will be a person sitting there, guarding the entrance, just tell him "handicapped" and they will shoot you down the hill to the lot..
When we got to the lot yesterday, they took our money and did not have stickers yet, they walked around putting them on cars, from that point on.
Couple of things, S2 the skybox lot never fills up and was half full yesterday, if you have a handicapped sticker, they can not park you on the grass. They will park you in one of the S lots, but you may get bumped from S1 down to the east.
The Iowa game in two weeks will be a zoo, it always is, we plan to get there around six if possible.