Unpacking, clean the display with a soft dry cloth, remove foil from the glass, placing (on the speakers Align).
Drop it and stauenen how the glass bubbles draws of himself!
Nothing could be simpler, and who writes that this is difficult, has 0 craftsmanship :-)
Dealer is very nice - had email contact with him.
Mitlerweile I have 6 disks installed on various phones and recommended it to family and co. These were convinced of the quality.