Haha! That's what we did as well...
We were packing in a leisurely and organised fashion for some weeks. We thought it was all under control... and then a day or two before the move it was suddenly WTF?!?!?! (Where's those extra boxes? What extra boxes? You've used all the packing tape?!?!?... Er, why is this room still not touched? Ummm.. Why have you unpacked all those boxes again? Whaddya mean we're taking the garden with us?)
Actually, it turned out fine... I guess it will for you guys, too

Good luck