Reassembly was much easier than disassembly, but the whole process took about 2 hours. Nothing broke in spite of applying some force that seemed excessive because the battery was glued in place. (I count myself lucky.) – Before installing the new battery, I removed all the double sided sticky tape which "glued" the original one in place; anticipating a future battery replacement. I hope the 10 screws which hold it in place suffice!
Good luck to anyone who ventures into this project; and may the part you're sitting on not pain you too much when you've finished!
Unfortunately, the damned phone has changed slightly from the one illustrated, now having 10 screws which have to be removed. Changing the battery is a true pain in parts unmentionable. Why does the battery have to be glued in place? This whole construction seems designed to make something break while disassembling. I think LG would prefer you break the phone and then be compelled to buy a new one. Bastards!