Have the glass for the defective S3 Mini my girlfriend bought since this had jumped / chipped. The change itself is carried out with Youtube videos themselves, but on removing the old glass, the display of the S3 mini is even broke down because I was probably a bit too briskly or have just pressed the wrong place / pulled.
The product is ok, for the practical implementation should take time and act with caution. I have the phone, unfortunately completely destroyed so that a repair not worth.
But fit the glass and quality of the product are perfectly ok. The included tool helps.