That is an important detail. I just watched a 5 glass replacement video on YouTube. It's a complicated process compared to the 3G's I've worked on. Things that scare me:
- The heat gun being so close to the sensitive LCD screen,
- The fragility of the digitizer, LCD and the flexible connectors,
- Their close proximity to the broken front glass,
- Potential seepage of the solvents used to clean everything up,
- The firm but precise force needed to remove the plastic film between the old glass and the digitizer (I snapped an iPod touch glass once - just while trying to open the case).
- The liquid goo needed to bond the new glass to the digitizer (high chance for dust and air bubbles being permanently embedded in your repair)
It makes Apple's $150 glass replacement seem a safer bet. Having said that, for $10 I'd give it a try
if I had nothing to lose. The downside might be that if self-repair goes wrong, Apple might then refuse the $150 replacement since the phone has been tampered with.