I added a few comments throughout that will hopefully make it easier for others. But on a whole, this worked beautifully. The pictures were extremely helpful. I suggest that anyone about to do this procedure not only read through it, but also read through all the comments before starting. I not only used the guide, but I used the ifixit replacement battery kit which came with everything I needed…except for flat tweezers. Completely successful!
The little tab that you pull back on, at least in my cable, was simple glued onto the rest of the cable. I tried to carefully remove the cable, and the tab came off. I did not have flat tweezers in the ifixit replacement kit and did not want to pinch the cable with sharp instruments. Therefore, be extremely careful when removing the tab as it is difficult to reattach the cable without it.
In step 13, notice the amount of the data cable that sticks out of the connector. When moving this cable to the new battery, it is difficult to tell how far to push the cable into the connector or when it is fully inserted because the cable is so bendable.
The underside of the tape is not uniform. Therefore, pay attention to which direction it is placed by looking at the underside when you remove it. Possibly mark one edge so that you can replace in the same direction during reassembly.
Step 3 was difficult as even moving around the entire perimeter carefully did not keep the clips open. But mine completely failed at step 5. Trying to lift the metal tab just bent the tab. Made sure nothing was attached all the way around, but could not remove the circuit board as indicated. Finally gave up and pried it out to see how it was put together even though it damaged it.