" : D
you were the only one with courage like me, and I read your post carefully before you venture into the place of "GLASS ONLY OUTSIDE".
I purchased the glass only by E-Bay about 6 € (arrived in about 10 days)
I wanted to say that with my method you put about 2 hours without disassembling the phone!
get yourself a micro optical screwdriver, something hard and plastic is not very sharp, knife and .... the [B] REMOVE SILICONE [/ B] spray ( 3€ ).
spray the spray along the edge of the glass of the phone until it starts to become unstuck from the edge of the glass and try to separate the edge, taking care to contacts of the lower part.
Once separated the plastic lip (helping with screwdrivers and plastic tool and cutter always being careful to touch the glass) to try to divide the 2 glass with the cutter and the spray (always doing dissolve the glue of the adhesive).
after removing all the broken glass, clean the glue touch the glass with alcohol and then remount the board appoggiateci pasting over the glass again with very little glue (I used bostik) being careful not to smudge the glass.
If you made a mistake of gluing always use the "remove silicone" to remove the bostik (or silicon) clean and put the glue.