The day of your move is all about getting you out of one house and into the new one – if you've hired a company, all you'll need do is oversee them, or stay out of their way entirely. If you haven't, its important to have some strong family members and friends on hand to help you shift everything into your van.
Empty one room at a time, and ensure the cupboards (if they are walk in) are also empty – once its done, sweep, mop or vacuum, and do one final pickup then close the door. Make it clear to the others helping you that sealed rooms are finished with, so that people aren't trailing dirt into rooms that are finished and clean.
Moving day itself will probably pass in a blur, so its important to try to savor your final moments in the house you're leaving. You'll probably have many memories, good and bad, there, and full closure on that period in your life is important, so that you can move on.
You'll want to keep a couple of boxes, or bags spare and on hand so that you can catch anything that you've missed, that's been knocked into a corner, or essentials that you've kept out for the move – the latter should be marked clearly so that you can find them at the other end.
Keeping your kettle, mugs, coffee, tea, toiletries and baby supplies (if you've got a small child) separate from your packed belongings might be a good idea, as is keeping any essential work, moving, utility or ID documents in a safe place during your move. The latter will ensure that they don't accidentally go astray, or are placed somewhere that you can't find them.
You should take a final meter reading, and where appropriate, shut down any water, electricity or gas supplies if no one is going to be in the house for a few days after you.