Can't get the adhesive off the phone battery (iPhone 6)

I've been at this thing for quite some time and I'm only continuing to get more frustrated as I go. Everything was going well, until I'm supposed to remove the adhesive holding the battery down to the phone. I attempt the way shown in the guide, of which, both adhesives snapped to below the reachable point. Looking through the comments, there were suggestions that I should heat up the back with a hair dryer until it's hot to touch, and then attempt to remove it using a few different methods. Of which, all has failed. I cannot seem to get this %#*@ adhesive off. The floss snapped, I tried with an old card and it doesn't appear to be strong enough, and I've tried using the pry tool which only resulted in ever so slightly prying the battery, which now appears to be bent along the edges, and I'm afraid to "puncture a hole and set a fire." I need to replace this rather quickly as I use my phone for important tasks quite often. Hopefully someone can help me. Thanks and have a good one