Growing up in a military family, we moved a lot. The running joke was that you needed to empty your kitchen garbage can before the movers arrived, because once they had packed someone's garbage! And by the time the moving van arrived at the new home, everything in the van stunk to high heaven.
Getting back to the OP's question, the moves we made--the movers came in and packed everything and loaded it all into the van. My parents would pack what the family needed to survive during the move and put that in the car and lock the car. Because there was this one time when all the suitcases were loaded into the van, despite the fact they were all in a closet and the closet had a huge sign on it saying "Do not touch. Nothing in here gets moved." Once the movers get started
, if they know everything is going, they just don't stop.
One thing to consider is breakables. Check with the moving company--my parents were told that if they packed the china and glasses, the moving company would move it, but if anything broke the moving company would not be liable, because they didn't pack it. And stuff does get broken on moves, no matter how careful the movers are. In the military, the saying was, "Three moves is as good as a fire," for destroying your stuff. I wouldn't go that far, but it did seem as if something got broken with every move. One time it was my bike.
