IceWoman,
Not that you can really do anything about it now, but they told me today that they would have charged me leave if I had checked in tomorrow (2/1). So, you may be charged a day of leave. I was very nervous also, but it wasn't as bad as I thought. Basically, get your orders stamped, hour long brief, and go to PSD. Many, many forms to fill out. Bring a black pen! The only bad part is PSD, and only because I hate paperwork. The stashed Ensigns are pretty much in charge of the whole check-in process, and they are all pretty cool. Good luck...