In my case, stuck in the middle. Pulled apart very slowly, giving the adhesive a chance to separate, and not tearing whatever it was in there. Kept an eye on the inside middle, and very SLOW let it separate. Or was that the battery? In either case, go slow on all steps.
On reassembly, these did not really click back in place. Held tight when reattaching the 20 (19 in my case) screws).
Reconnecting the battery was difficult, did not align exactly. Note there are 2 slots that line up and 4 pins. Used a 10x magnifying lens with LED light, purchased to do this job. This step (reassembly) is where the magnifier came in handy. Had to move battery around a bit to get it to line up. Ended up removing adhesive tape from battery, so I could get in place to attach the connector. Battery held in place with screws and phone case, so far so good.
I did not have a pick, used a few old credit cards, leaving them in place to keep the phone back separated.
Used a hair dryer to heat up a little, one section at a time, was enough to remove. Pulled apart slowly.
Left adhesive on the back and on the phone, where possible, using a tiny screw driver to separate. Reused whatever adhesive remained to reattach.
I did not have to remove the screw holding the volume buttons bar in place. These stay attached, not needed for replacing the battery. Just the 20 screws shown.
I stripped the threads on one of the 20 screws, had to drill it out. (Managed to do this without cracking the screen, completed battery replacement, all ok.)
Careful removing the screws, be sure of tight grip. I saw T4 torx suggested on another site for Moto X Pure, this might grip better? Try both.