I would think room by room (so have boxes for only main bedroom things, only study things etc) and then think by weight. I have always tried to keep all the boxes of a pretty even weight.
When I am unpacking, I like to have things like DVDs in only one box, I don't like them to be spread over lots of boxes as then it wastes time at the other end when you think you've done all the DVDs only to find more!
I put things like duvets, towels, toys, cushions etc in the really big boxes.
Keep whatever you will need for your first night and following morning to hand too!
* Use things like bins/laundry baskets etc to store towels/books/toys etc.
* Rather than bubbling hanging wall pictures, bubble and then slip into an unmade box that fits them (like a sleeve) and then tape around edges. Much more secure than moving about in a box and risks corners getting doofed.
* Buy removal guys lunch - pizza/cans of coke etc - always good to be nice to them and they'll care of your stuff.
* Don't overpack boxes of books - put some in the bottom and then fill with bedding/linen/other stuff that's light.
* Use old tins/plastic lidded boxes etc to put away stuff from junk drawers that you want to keep and buy elastic bands to tidy papers/documents that need keeping but aren't filed. (I had a tin full of blue tak/safety pins/ink pad/tipex/penicl sharpener etc - that would normally live in my junk drawer).
*Use towels/tea towels to wrap some stuff if it's easier - saves space too.
*DVDs/books etc can be packed as soon as. Then seal boxes and stack out of the way.
Good luck with your move - we're forces and about to do our 9th move in 12 yrs!!!