Here's a workable option, for the majority of us. It won't work for the overly paranoid and those that play SP with only one account (is there such a thing?), though.
Step 0: If you have two or more accounts, and have more than one home on the shard, move everything over to the other house(s) that you can.
Step 1. If no additional houses available, find someone in the game you can trust. Ideally, this will be a family member, but can be a friend, guildmate, etc. Their home (or your own other homes if you fit into the Step 0 category) will be your safehouse.
Step 2 - Consolidation:
2.a.: Convert all your items that can be put into commodity deeds into the smallest number of possible deeds. remove these items from your bankboxes, and carry them on your characters (As these are now your lightest possessions, instead of your heaviest)
2.b.: Take all your characters (including those on other accounts), and load up all their bank boxes with as much as you can, starting with your heaviest items (after converting the deedables to deeds and gold to the largest checks possible). Be sure to leave enough room in the character's bank that will be demolishing the house for the resize, plus enough gold in check form that (With the returned gold from the old house) will allow you to build the resize. If you have more than one account, and don't have all character slots filled on all accounts for the shard, now would be the time to create even temporary characters, to use their bank & pack space. This should take care of anywhere from 50-100 items per account, more if you bought the extra space.
2.c.: count the remaining items. If you have about 200 items or less, per character (including those on other accounts on the same shard), go to 2.d.; if more than 200 per character, go to 2.e. At the completion of 2.d. or 2.e., if you STILL have items left over, you'll have to find someone who will loan you more secures at other locations - but that is very unlikely to occur, unless you got a LOT of heavy, unstackable, undeedable, stuff, or are attempting to move a lot of stuff from vendors (in which case you'd be better off getting rental vendors somewhere, and moving the stuff there while you move, instead of packing the vendor items - even if unpriced BODs in books).
2.d. (for the reasonable item numbers): make sure every character has a giant beetle; load each beetle, heaviest items first, mount the beetle, then load your characters. If you run into weight issues still, buy pack horses for step 3. Go to step 3.
2.e. buy however many pack horses you need to hold the items, with your characters. Loaded pack animals won't auto-log.
Step 3. This is where having a trustworthy friend (or another house, even if with 0 lockdowns) comes into play. Take any pack animals (other than beetles being ridden) to this safe location. Park them, and log out there. If you really trust people there, you might friend them to the animals to keep the animals happy while you're busy with the house.
Step 4: Take the character with the leftover bank space and gold, and resize the house. Quickly build the basic structure of the new home.
Step 5. Return all the pack horses to the new home, and place the items in secures that will be in areas unaffected by further customization. Since your home is now resized, placed and partially built, the most that will probably happen is that if you make a change the game doesn't like, the items will go to the moving crate.
Step 6. Finish the house construction/deco of the sign-driven type, then unload all the characters and any beetles they are on, into secures. Do the same for the stuff stuck into their banks for the move. Be sure to label the chests and bags as to their contents, as to re-deco your house as quickly as possible, and get your secures of valuables where you want them. What's left over, do whatever you wish (donate, trash, stick on vendors, etc.)
even I had a lolwhuat???
