The adhesive tab has a small extension tab with a hole in the end closest to the ear phone jack. If you stick the tip of your spudger through it, you can use it to lift one end and get you started.
I completed this repairs along with a display assembly and battery replacement. Doing all 3 together took about 1.75 hours. The key is to use a mat with labeled squares (Step# and screw size) for all of the removed parts and screws and keeping the screw of different sizes clearly separated. The major challenge I found was seating the new LC connected assembly into place while exposing the sections new adhesive. I ended up removing the backing and seating it in three sections. Thankfully all of the assembly is bolted down as well. My iPhone 6 now has a new display, new battery and charges properly due to the new LC connector. It is like having a new iPhone again! Thanks, IFixit.