The screen got smashed when the phone fell on a concrete pavement
Referred the guide available here http://www.ifixit.com/Guide/Samsung+Gala...
The entire process was smooth. It took about an hour as the model of the phone I had was slightly different from the one in the guide. There were some minor differences such as the screws which held the motherboard in place were at a different location, there were more ribbon cables to be detached. There was a thing that looked like a watch battery with a red and a blue wire coming out of it. Those wires were soldered to the motherboard. Took care to remove it without any damage.
Used a hair dryer to heat the screen in order to remove it.
Stay calm and use your common sense when you are faced with something new or different.