Remove heatsink and CPU from box.
If you are using a third-party heatsink, make sure that you check out this How-To on how to apply thermal paste.
Open the motherboard latch on for the CPU socket.
Open the cover plate.
Gently place the CPU in the socket and give it a slight wiggle to ensure it is installed safely.
WARNING: Ensure that the CPU indents fit into the socket. This step should require little to no force.
Close the CPU cover plate. The plastic cover should pop off by itself.
WARNING: DO NOT TOUCH THE SOCKET PINS.