Do a little dance, then sigh a little sigh. He's ready; you're ready. It's a brand new world for both of you.
Snap photos and email them out to grandparents before you take off for work. Mission accomplished.
Linger a little bit longer by the classroom door, hoping to sneak a peek at circle time. Then, head into the office to offer your assistance in the classroom.
Give your child a big hug and head off without a worry. "What time is pick-up?" you wonder.