The adhesive on the back of the battery is two narrow strips along the sides, mine didn't have any in the center. So as soon as you pry up one edge it's pretty quick to get out.

Yeah, I wasn't able to jam a pick into the corner, it wouldn't catch. I used the end of the tweezers to lever the midframe up a little bit, and then was able to get a pick in and slide it along.

As others have said, the iOpeners didn't work for me at all. I tried microwaving, I tried boiling, but even when the iOpener was too hot to touch the phone didn't get that hot. A hair dryer eventually worked, but took a long time too, and I had to pull quite hard (similar to pulling on a really stuck LEGO brick, I was surprised my screen didn't crack). I also dripped some isopropyl along the edge where I could lift it a teeny bit but not get a pick in, which seemed to get the gap to widen. Once I had an edge up and could start sliding the pick along though everything went much more smoothly. Reading other comments, I bet a heat gun would have been a better tool.