I tried all the solutions here and none of them worked. For me I was replacing the battery which I had previously replaced, and I think the adhesive was too brittle, and very sticky.
The solution I found was to use a 30/60° triangle ruler, I could use the top part to latch on to the adhesive and pull it out. I was also able to just push the adhesive back with it. It did cause the battery to bend quite a bit, but in the end it worked!
Make sure when you put the EMI Shield back on, that the home button connector socket is not tucked beneath the shield. I got to the home button replacement step and I couldn’t find the socket to connect the connector with!
There were two screws which I couldn’t remove no matter what. I was forced to rip apart the metal with pliers until the screw was forced off. This took literally an hour to do. So annoyed.