Sure, glue sucks, but I didn't need a heat gun (or hair dryer), just the microwave heated tube thingy and the slicer tab. Admittedly the old battery was a bit spicy pillow which may have helped, dunno. If it's too imposing, just get a pro to do it.

Afterwards I got a 'chargie' which connects between the wall charger and the phone and lets you choose how much to charge it to, e.g. 80%. More importantly it lets you cut off charging when the device is over a certain temperature, e.g. 33C. Pretty sure the old battery cooked itself during summer, it was happily charging at 50+C, which is definitely not good. 2 years later and it still reports 99% health (although it mostly stays in it's wireless charging dock, so YMMV). Like that you may not need to replace the battery more than once during the 7 years of security updates the more modern Pixels have.