I just did online check in also! I can barely stand it! In 10 days, I'll be eating my arrival dinner at Chef Mickey's and walking over to Magic Kingdom for my first stroll of the week down Main Street!
I believe anyone can do it once you're 10 days out from your trip! My TA emailed me the link to do Online Check In, but you can google it and do it that way! Have fun on your trip!!