A few final thoughts while I still remember this stuff:
In measuring for your pack-up, when you are looking at a 100cu.ft. shipping crate, be aware that it doesn't actually hold 100cu.ft. - that's the basic footprint of the box itself in the hold of the ship/truck. You can get about 80cu.ft. worth of stuff in one (give or take). You'll want to get the precise interior measurements from the company you're going to use so that you can sort out exactly how much space you actually have available. (There always seemed to be "just one more thing that we really want to take" in our case, so it mattered.)
If you self-pack, be aware that the shipper may need to be able to see inside the boxes for their own liability purposes or they may refuse to take a self-pack job at all (except for entities like UPAK). If you self-pack, you may also only be eligible for the basic insurance (that covers if the entire load is lost or damaged beyond repair), so if you do self-pack and go with a company that will allow your snow globes, pack them really, really carefully. And be sure to read up on the insurance options.
Also, about the packing boxes. If you get some that say they measure, for example, 14"x14"x14" be aware that is the ~internal~ measurement, so you'll need to measure one assembled to calculate how many will go in your chosen shipping space if you intend to tetris boxes into a crate yourself. I would suggest going with one uniform size of box if you can - it will make it easier for whomever has to do the final pack of your pallet/box/crate. Our guys were really rather amazing at how much stuff they got in our big wooden crates - we had the "definitely must go" stack and several other items that we were preparing to leave behind due to lack of space, and those guys got them into the crate, too - including a large work table. But they ended up re-packing some of our stuff into other boxes to get it to fit in the crate. (I have to say, in watching them work, they were really, really impressive packers. I've packed a lot of U-Hauls for moves in my day, and I've got nothing on those guys!)
Good luck!