Hi, The screens available on this site are of good quality, i've bought a few and they have always been good, you don't notice a difference. The person who fixed your phone for "quite a large amount of money" would have also used a similar quality screen if not the exact same one.

The glass is in fact VERY hard to replace, especially if you don't know what you are doing. I regard myself as quite an expert when it comes to repairing devices and i find it difficult.

It involves needing to heat the glass and surrounding areas with a heat gun, melting the adhesive substance that binds the glass to the frame. You then have to clean off the excess adhesive and use a new batch or use the old remaining substance to fix the replacement glass back on by heating it up again.

Shards of glass are involved, a potentially dangerous heat gun has to be used and it's just over all a very unnerving experience.

My best opinion is to just buy a complete front assembly replacement and do that instead.

Good Luck.