Fingers crossed Boris!!!
in the few weeks before you move, label a large box "open first" and start putting essentials into it. Pair of jammies and undies and set of clothes per child, box of tissues, toilet roll, 5 cups/plates etc (plastic), baby wipes, pens and pencils, paper, camera, can opener, box of cereal, long life milk, etc etc.
On moving day, make sure the box either goes into the truck last, or, better still, goes with you in the car.
I second cant sleeps tip of sorting the loft/garage NOW. Also storage cupboards (DC old clothes? Your old clothes?) and papers and documents. Do them NOW!
Once you start packing, do the stuff you never use first - back of kitchen cupbpards, the good china, whatever, and label those boxes with numbers in order. So when you are unpacking, you know that boxes 1,2,3, etc are pretty unimportant and don't need to be unpacked in a hurry.
We ended up doing as much as we could ourselves over a few weks - all the easy stuff like books and linen, and then paid packers to do all the china/glass/ornaments/framed pictures etc, which didn't cost too much but saved us hours.
I might think of some more...