Thank you very much for this guide. The whole process is easier than expected.
Switch off your Mac and continue without disconnecting the battery. Don't know how it will switch on by itself.
I skipped this step complete . There is space enough in order to manipulate stuff without unplugging theses cables.
This is the most difficult step while resembling. Take special care of the 2 10.3 Phillips screws tabs positions in order to resemble as original.