Weight and space are what set the price on a long-distance move, so everything that goes onto the truck is also sitting somewhere on the invoice, including the coats nobody has worn in four years and the two boxes that never got opened after the last move, which arguably tells you everything you need to know about what's inside them.
Start with the garage, the attic, and the top shelves of the closets, because that's where everything quietly accumulates when you aren't paying attention.
Give the selling and donating about six weeks of runway, since none of it moves on your schedule and all of it moves on somebody else's. A sofa can sit on a marketplace listing for the better part of a month before anyone serious turns up, charities generally want a week or two of notice before they'll send a van out, and bulky waste collection arrives when the council says it will, which is usually once a month and almost never the week you happen to need it.
Numbering them is worth the extra few seconds too, especially with a running list on your phone of roughly what went into each one, because a minute per box is the difference between walking straight to the kettle and opening nine boxes in a kitchen you don't know yet.
Keep One Bag With You
Something on moving day runs late, and it runs late often enough that you may as well plan around it rather than hope.
So one bag never goes anywhere near the truck, and into it goes two days of clothes for each person, every charger in the house, medication, toiletries, a couple of towels, coffee along with whatever you actually make it in, a screwdriver and a utility knife, and the documents you would genuinely hate to lose. That bag travels in the car with you, nobody tapes it shut, and nobody loads it onto a dolly at four in the afternoon.
If the truck arrives a day behind schedule, that one bag is the reason the first night is mildly irritating rather than something you're still complaining about a year later.
Keep Moving Day Simple
Parking, building access, and time are where the trouble comes from on the day itself, pretty much without exception.
What you want to establish well in advance is where a truck of that size can legally sit, whether the building expects the elevator to be booked ahead, how many hours the crew is actually contracted for, and who is going to be standing at the new address holding a key when they pull up. That's four questions, and asking them a week early costs you nothing at all.
Keep the paperwork and the payment on your person rather than in a box that went onto the truck twenty minutes ago. Read the inventory properly before signing anything, and write down whatever is scratched, dented, or missing while the crew is still standing in the driveway, because once your signature is sitting on a clean inventory sheet, any claim you make afterward turns into an argument you're not especially likely to win.
Plan the First Week As Well
Arriving is only halfway through the move, and the week that follows is the part people consistently underestimate, mostly because they spend it running on four hours of sleep and whatever gets delivered.
Pick the rooms that genuinely have to be finished first and then let yourself ignore the rest, which for most households means the beds, one bathroom that works properly, and a surface somebody can open a laptop on by Monday morning. Everything else can sit in cardboard for a fortnight without a single consequence.
Try to keep two evenings free during that first week and spend one of them registering with a doctor, working out which grocery store is the good one, and walking a few streets in whatever direction looks the most interesting, because unpacking isn't really what makes a place start feeling like yours. Being outside in it is.
The Short Version
Moving still won't be fun when you're finished reading this, but it will be spread out across a longer stretch of time, and that's a meaningfully different experience even though the total amount of work hasn't changed.
Decide who's doing the packing, get the delivery window in writing, clear out whatever isn't worth paying to transport, label the boxes for where they're going rather than where they came from, and finish the paperwork in one sitting.
Handle those five early and the final week ends up with almost nothing left in it, which is the whole difference between a move you shrug off within a few days and one you're still quietly recovering from in February.