Welcome Nathan!! Well, if you check the official Mopar website -
www.mopar.com, you'll find the chrome grill there for $125.00 (mopar part# 82211165). You might also want to check Ebay, but I'm not sure how much 2008 stuff there is for sale there. Also, check out
http://www.wyckoffchryslerparts.com. They don't have much
yet for the 2008 model (at least not on their website), but I ordered several parts for my 2002 KJ from them. Their prices are pretty much by the book (I never encountered them marking up prices but I can't say that they never do) and they can be very helpful in helping you determine what part you need. It's not a big operation, so they get very busy sometimes. Other than that, no complaints..
As far as the difficulty, I can't imagine it'd be very hard at all. If you give me your email address I can email you the instructions (in .pdf format). I will put a link to the instructions
http://www.mopar-accessories.com/en-US/imagehandler.ashx?id=13987 but I'm not sure if that will work...
~kk