Slightly cracked Screen- has anyone actually replaced the screen?

Yeah I know there are several threads about this out there. I'm about to buy a square trade warranty on it since I've only had the phone 2 weeks as of Friday. At any rate, Phone slid out of my car to the ground, so yeah it was dropped... barely.. I have a crack on the left side which has actually expanded since last night and also on the bottom, across the right side to the home button...

Has anyone actually tried to replace the screen? I've seen some people say "oh its easy" to "oh no this is impossible to do"