cracked lcd screen on lg vx8550 (chocolate)

My son kneeled down yesterday and kneeled right on his phone which was in his shorts pocket. The phone still works, but the front screen now just shows some bright colors and looks to be cracked underneath. The front glass if fine, it's underneath that looks cracked. We have ins. and have filed a claim. However, if it is not too expensive and not too difficult to do, I'd like to try and fix this one for my husband. I do see the LCD online at a couple of sites. My question to you all is has anyone ever replaced this? if so, is there a trusted site you purchased it from? And finally, how hard is it? thanks for your help!