Is iPhone screen replacing easy? Is it worth having a go?

I'm thinking to learn how to fix iPhone 3GS/4S screens but not sure if ill be able to do it? There are tutorials on YouTube on how to do it and if I do learn I could charge people for it as it is really expensive to get them fixed at shops!

Yes it is easy I have a friend who does it she's not a professional she just said thine time her screen broke she Pope's it out and put in a new one (after she ordered the new screen of course) I would recommend getting it professionally done

Why not try to repair it yourself? I recommand you this famous site ETrade Supply to select the parts you need and fix it yourself instead of going to the shop. The price can be very low
4S: http://www.etradesupply.com/apple/iphone/apple-iphone-4s.html
3S: http://www.etradesupply.com/apple/iphone/apple-iphone-3gs.html

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