Put small stuff in small boxes which fit into larger ones. For example if you put cutlery and the like (drawer by drawer) into a shoebox each, then pack that into a larger box it's better manageable. Smaller items have a habit of getting lost, too, so that risk is diminished in a small box.
Know where your furniture goes so you don't have to move it again. If you have bookshelves, get them unloaded first and put in place. You can then unpack your books quick and easy and get rid of the stack of boxes. (Says she who moved close to 5,000 books last time.)
Essentials in overnight bags, enough to go for a day or two (or three). A plate each, a mug each, etc in a box and keep it with your overnight bag, put it in your car (if you have one) away from the rest of the moving stuff.
Use (spare) pillows and chair cushions to bolster boxes with awkward/breakable stuff - the pillows/cushions are bulky and take up a lot of space, this way they've got a useful purpose.
And definitely declutter and don't move what you do not need. The local charity shop can always handle stuff, be it clothes or knick-knacks.