The instructions were absolutely clear( even if I deduced some of the words from the context) :-) The only difficulty for me, was to put as much power on the putty knife as necessary. Too little and too shy at the beginning. ... but then you get the necessary feeling! Again it's not as difficult as it seems in the beginning. By the 25-th fixing you can open a little fixing shop :-D. Thank you iFixit!!! Thank you all enthusiasts who post here!!!