I totally feel for you, we are moving to Alabama within 3 weeks and everything has to be in a box. So far I have my office, the 2 spare rooms and all the knick knack stuff mostly packed. Still have the kitchen, 2 baths, master bedroom and the basement left. We have to put all our stuff in storage when we get there because we don't have a place yet, so all work stuff, dog stuff, etc. has to travel with us. We have horse haulers coming to pick up the horses next week, so that will be one less thing to worry about. I had to get rid of all my live plant because the movers will not move them, my DH works all week so all the packing is up to me. I HATE MOVING! Hopefully we will retire in our new place, I really don't fancy doing this again.
I did get him motivated to go through his stuff by telling him I would be glad to do it for him, but reminded him that I like to throw things away if I don't think they are useful. I also had a huge pile in the barn and let him know it was all going to the dump the next day so if he wanted to save anything it was now or never!
I can be stressful to pack and move, but just remember how good it will feel once you get done. And think about all the decluttering you are doing!