recent 3800+ stepping have been OCing better than recent Opty 165s. many have been reaching 3Ghz on water and 2.8 on air.
dual cores are also great for gaming as many newer games are built to take advantage of more than one core.
also i saw no one answered your question, so .....it is pretty easy to install a cpu.
lol just go slow, read all instructions, and stay away from carpet and water.