If you do want to upgrade that processor, then you will need to replace the motherboard as it is designed for different socket types. See here for a list of AM3+ motherboards, which is the socket that you need. I would also get a 3rd party cpu cooler as the ones they send you usually can't keep it cool during gaming.
I would also say that getting another 8gb of RAM would be good, 16gb is becoming the standard for gaming pc's now. Not necessary just a recommendation.
As for installing it, there are loads of good tutorials on youtube, and many of us on here will be able to help you with any issues.