CAVE: I broke off one of the connectors to the magnet-charger contacts on the very edge of the mainboard when lifting it off the case. The same seems to have happened to the author (Step 8 and 9 - the lower one of the two black bridges looks rather wonky)
Pitfall: When lifting the vibration motor (Step 7), make sure you check the cable running on the underside of the mainboard afterwards. It is the connector to the on/off switch. If you unplug it accidentially (like I did), you won’t be able to turn your phone back on after the work is done.