Just did this, it was a lot more work (and fun) than replacing batteries, which I've done a few times. Definitely prepare to have lots and lots of screws and parts to keep track of - I divided the cardboard tray the parts came in with little ridges of tape and numbered the steps under the parts. The one comment that is definitely one to look out for is how to reattach the new part to the logic board - that piece has to line up just right and I found there's a little play you can work with in how the lightening connector is pasted down, so don't do that too permanently before connecting. Once I finished, the home button didn't work. I found potential explanations on ifixit, and you can replace it, but as a workaround someone here posted how you use accessibility options to put a home button on screen and bypass the button altogether.

Instructions are confusing as the last step says not to insert at certain points, while this says to slide all the way up the right side - is it that sliding is ok but inserting isn't (whatever that might mean) or just not more than 3mm?

Accidentally pulling out the logic board socket is no idle warning - exactly what I did without much effort. I think this shouldn’t be described as ‘prying’ up because it implies needing to use force - but these things actually pop off quite easily with a nudge, which you discover at later steps.

The adhesive tabs broke the moment I touched them - the woman in the video must live in an alternate, better universe. The alternative of using a credit card definitely won’t work on its own as described - it’s thicker than the gap between the logic board and the battery. I fashioned a thinner piece from an old package and between that the leverage of a credit card a bit later, which still broke in two pieces, I got the battery out, but destroyed the ribbon cable running down the side of the phone. So looks like I’m off to the apple store after all.

I destroyed the ribbon cable that runs down the side of the case toward the headphone jack (not mentioned in the instructions!) while trying to wedge the battery out with a credit card. Am I SOL or is there a fix?