This was my first iPhone repair. I was too cautious with the battery connector and spent longer than most would have fidgeting with it. The pressure sensor kept popping up a bit as I worked on the connector, and I wasn't sure if that was part of the tab I was supposed to leave alone. When I did get the battery out (I had to pry it out with one of the plastic shims) the pressure sensor went with it and for a moment I thought I had just destroyed this phone. Fortunately I replaced it and set the new battery, and the phone booted.