We def. had a lot more when we moved from our rental house to our home we had built but as far as boxes I really don't know. Part of the thing is my husband and I had things over at our parent's houses in their basements. We had lived in apartments with little storage and then our rental house had zero storage and there really wasn't a rush to get the stuff..until we had our own large basement to shove stuff in
When we moved from our individual apartments to our rental house we just picked up a small u-haul truck, when we moved from our rental house to our home that had been built we largely used step-father-in-law's truck, his flatbed trailer, our cars and a few of our friend's cars. It was just several miles south our move.
I did label this time around about 80% of the boxes as far as what was inside with pretty good detail but eventually I gave up lol. Each box however was at least labeled with a color coded label what room it belonged in, this way with people helping out it was easy to tell them "kitchen" "basement" "master bedroom" "dining room", etc. That would be one of my biggest tips because it saves you from having to direct people all the time.
Another tip is use large trash bags for your clothes that are already hung up. Just wrap them up in it (bottom of bag bottom of clothing) and tie up by the hanger. You'll save time and energy from not having to take off the hanger, fold, then store the hangers, etc.
If you're thinking about moving next year take some time over this year to go through things to condense down. Do things over the next several months for items that you may want to have a garage sale for in the spring (assuming this is your garage sale season) if you want to have one. If you do this you can start accumulating boxes of things instead of rushing last minute and realizing you don't have near enough boxes or you have too much or you have the wrong sized boxes for your needs. Keep in mind boxes should be ones that can be picked up reasonably.
We have not hired a company yet for moving but if we move from this house we probably would for at least the big furniture. Only things I've worried about is damage to property. I'd rather the damage come from us than constantly worry about someone else but I may not have this worry as much by the time we would end up moving from this house.