This is what happened to me. They didn't ask questions as they had all the answers. They seized my passport, offered me a PRRA (which I waved), they gave me an exclusion order for one year, which it will only apply if my application is rejected and told me to come to their office every Wednesday and sign a paper (which takes 1 min).
They also explained that I should not work, commit crimes, etc all the common sense stuff.
It's nerve wracking, but if all you have had is the "out of status" I think you'd be fine.
My wife went with me, although they didn't ask me to.