Go to Crutchfield.com. I bought a JVC double din unit and with their low priced installation kit that included a new plastic trim piece, and wire harness adaptor, I was able to install the stereo in less than an hour. It almost looks factory after I set the display color to blue to match the interior lights. You'd be amazed at how much better the factory speakers sound with a head unit that has a little more power. Good luck.
I've just ordered the Kenwood DMX706S and two sets of these Infinity speakers to replace the factory sets. I have the same head unit in my 2012 Corvette. It sounds awesome and has all the features I need. Crutchfield supplies EVERYTHING you will need for the install. Like Ray said...install is a breeze.
Edit: If you order from crutchfield get the prewire service...this makes the install even easier. You may have to call or chat with them to get it added to your cart.