There is a manual in English for the establishment of protection but, even without a manual, it is very easy to affix. It only clean the screen, for example with a "cloth for glasses."
Adhesives seem to be on the black outlines (but maybe I'm wrong). Just make sure you position the protection during the "collage". I did not see air bubbles in my two bonding operations ... That's great!
The protective plastic is very rigid, thick enough and obviously well puff No risk of losing pieces if broken.
As with any display equipped with protection, there is a light loss. Here she is a minor. One can almost believe that there is no protection ... It's really discreet.
When I pulled my first protection due to a broken top, I managed to remove it by embedding a bit my fingernail on the corner and gradually it went off ... without damage the original screen: There was intact after all removed (2 years later, it's nice to see no scratches on it!)
Small problem, however unimportant: Instead of writing the Canon center bottom of the screen, there are written on the bottom "GCS" in the center and "550D" right.
In short, go there with confidence on this purchase is really a useful product for those who want to keep their intact original screen! I highly recommend this product, and I do not regret having bought twice.