We used my heating pad set on low, placed the case on it, about two minutes and using the opener tool, lifted the battery out. This was the only bump/snag we had, the remaining steps went well and I have my phone back.
Total time for me was 55 minutes but some of that was rewatching the video. Easy to complete and my phone is working like new.
Couple of tips
1 - if you have a small flat refrigerator magnet or magnetic business card, lay it on your work surface, magnet side up, to hold all your tiny fasteners.
2 - no iOpener or heat gun, I used my heating pad it worked perfectly and no worries about getting your device too hot.
Thanks iFixit, definitely as easy as advertised and I couldn’t be happier with the outcome.
If you don’t have an “iOpener” or heat gun, try using an electric heating pad. I have a small $11 pad I got at CVS for my knee. On medium heat it worked fine for removal and with the “pennies” for setting the new seal.