I took the back cover off, then skipped down to step #50. I used the provided plastic card, sliding/wiggling it though the adhesive that attached the battery to the case. It took about 10 minutes to remove the old battery in this manner.You do have to be very careful not to pry too much on the two center cells, as they attach to the back of the trackpad cover, which is bendy.
Before installing the new battery, I removed the old adhesive, trial fitted the new battery, lining up the holes of the connector bracket, then marking the case where the battery aligned correctly, using a sharpie to do this.
After reassembling, I hit the power button—nothing. Worried, I figured that the battery was not charged, so I connected the power adapter, and after a few minutes started up normally. Battery showed a charge of 96%. so I’m guessing the startup procedure saw there was a new battery and wouldn’t go. All seems normal now, took a few minutes to charge to 100%, and now will drain it a few times.
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