I don't think these are PH1 screws.

No idea what this is supposed to mean. The name of this guide is "replacement". The final instruction here is to "test the wheel's usability"?

Very hard to do from this side. I recommend removing the mainboard and trying this from the top where the battery connector is. There is an area flush with the base surface.

The battery is very hard to remove because it has adhesive under it.

I recommend you to disassemble the mainboard and lever up the battery from the top as there you will have the only accessible flush area to really slide something under.

Zuerst den SIM Kartenhalter entfernen.

Eignet sch auch Isopropyl-Alkohol 99,9%?

Verwirrend: Es sollte heissen, dass man an den beschriebenen Stellen eben NICHT hebeln sollte.