iPhone 4 - Cracked Screen
So my lady has dropped her phone and cracked the screen quite badly. Phone still works fine, just very hard to see with hairline cracks everywhere. I know it can go into an Apple store / dodgy fella on the street who can fix it (£50 I hear is the going rate for this), but I've also seen articles which say it's not hard to fix yourself. I'm pretty sure I can do it, but there's a wealth of kits out there ranging from £5 to £50, with Amazon reviews being very inconsistent on all of them.
Has anyone done this? If so, how difficult is it? If it's going to cost £20+ and take a few hours, then I might as well spend £50 getting it done by a professional and not have the hassle, but if it's £5 - £10 and less than an hour, then it's probably something I'm happy to do myself.
Also, do I need to be careful which kit I get? From what I can tell, the iPhone 4 and 4S are pretty much identical, but are they that identical that a 4S kit can be used on a standard iPhone 4? It's a white iPhone as well, which seems to drastically reduce the choice of kits from what I've seen.
Any advice appreciated!