shattered screen can come apart into pieces when being removed, so be very careful.
3. just buy the $15 home button ribbon cable when you buy the screen and count on replacing it. given my experience i would say the average person is at least 50% likely to damage it during screen replacement. i would rather spend the $15 dollars than be stuck with an non-working phone while i wait for the ribbon cable to be delivered. not to mention paying the shipping cost twice. 