X-bit Labs wrote a nice guide for newbies to explain overclocking techniques and tools:
Everyone can feel confused in a strange situation. When you find yourself in an organization for the first time, you don’t know where to go and whom to talk to. When you sit down at the steering wheel for the first time, you can’t make out what to do next with the vehicle. You don’t know what to do when you first turn on your PC or enter the Internet. You’ll get the experience over time and go right to the elevator or turn on the ignition or perform the habitual sequence of actions on your PC almost subconsciously. But you need a guide at first and this role is going to be played by this article.
Why do you want to overclock, anyway? I guess there are four types of overclockers..