Come on guys! it takes few minutes doing this! I say maybe about 10 minutes less or more ....
initially I only taking the LCD part and put a new digitizer on top, but after a while I noticed most of time only the glass part on top of the digitizer layer works and in fact the glass on top is not a part of electronic parts and with a little bit of trick only taking the broken glass on top. glass layer on top is sit on the digitizer pad for better protection and reducing cost of production for digitizer.
Digitizer part is a kind of conductive film which is a bit softer than glass and most of time not broken. the film is a kind of Mika, same as the clear film that used to cover the old kerosine heater. they are very resistance to heat also flexible as well. so when digitizer works and only the glass gone you should take the glass part only, then a $2 glass that sold as protection for LCD on top of the digitizer that even is most cost effective.
you can find the glass only cheaper too ... anyway wasn't sure if this post is real and true or maybe very old and not updated! lol