hi beansmum, can't sleep and saw your post check out:
www.relocationapartments.com/relo-checklist.html
www.kellysuts.com/?categor y_id=546
Have a digital camera ready on the day of the move and photograph the boxes leaving the house and some of the more valuable items when packing. So you can prove your claim should something happen to them.
Pack all docs which are valuable into your luggage which will accompany you. Also, set aside items for 2 weeks min. which will tide you over once you get to NZ.
Pack a trolley per kid now, so that they can pick items they like without stress and last minute hectic.
Give back lent books, CDs and the like, take the opportunity to say goodbye to friends/neighbours, etc.
Keep calm, have a glass of wine and relax. People can always reach you in NZ and send stuff to you should you have forgotten something. It is always stressful to move house/life no matter how near or far. Do you have friends/family in NZ? Maybe they can look after the kids for a few days while you sort beaurocratical stuff out.
Oh and pack some Melatonin for the flight and Coffein tablets once you get there.
Skype will tide you and the kids over any homesickness when it comes to friends.
Good luck!