Translate what Thibaud had said:

done in just over an hour.

A good half hour just to take the battery off, I don't want to damage it or the phone so I took my time.

I find the iOpener too small, so I was inspired to make a bigger one, with water and 3-layer freezer bags to avoid any unwanted leaks and condensation.

Good tip, thanks Thibaud.

However, the reason step 3 and 4 should not be skipped is Step 6 — Use an iOpener to loosen the adhesive beneath the battery. I.e., the adhesive cannot be easily removed without heat, however, that heat might damage the electric chips. Thus they’d better be removed first.

Translate what Bobby mcgee said:

Step 3 and 4 can be completely ignored. What for? You can continue with step 5, just disconnect the ribbon cable from the fingerprint sensor on the back cover and you're done.