Intel® Extreme Tuning Utility works great for OCing if you're new to it. It makes everything as simple as possible and also has monitoring tools to keep an eye on temperature and core fluctuations.
You simply increase the core multiplier to desired frequencies. Increase voltage modestly to improve stability.
Overclocking and over-volting will reduce the longevity of your processor if you go too far. The i7-4770k can sit comfortably at around 4.3 - 4.5 ghz with a small increase in voltage.