I found that I could easily skip steps 17-22 (removal of screen), which saved quite a bit of time in the whole process! The battery, hence the phone, is performing excellently, with no problems!
**But I should note that the old battery was able to be removed by stretching the old adhesive strips without them breaking, so heat was not needed. I don’t think it would have been possible to keep the screen connected if a heat gun or hair dryer had been required to break the adhesion of the battery to the back case. Steps 17-22 would have been required in that instance. Thanks!!