Help fixing the front screen of an iPhone 4s?

I just dropped my iphone 4s and cracked the entire front screen. The LED or actual screen isn't defected and the touch screen works perfectly. The only problem is the broken glass. Do you guys recommend buying my own new glass screen and installing on my own, or should I take it to a repair place and let them handle it? Please tell me what I should do and how much time and money it will take (aprox.)!

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If you replace the glass screen alone, you'd better go to a repair shop, because it's difficult to separate it from the LCD screen. But if you replace the whole screen, it will be easy and you could do it yourself. You can find the cost of these parts from following.