2 - 5 minuten
My girlfriend was the one with the problem. Cracked bak on her iPhone 4. So i decided to buy the Transparent back for myself and give her the back to mine. Not only is it cheaper overall, especial because i was not oing to let her go to apple to get it repaired, i get an Awesome looking phone too!!!!
The repair went all too well. Very easy, fit like a properly sized glove.
As long as you can tell the difference between unscrewing a screw and stripping it, your good to go.