It's really a matter of increasing the core speed multiplier, stress testing, watching temps and adding more vcore when the stress testing reveals instability. Max safe and stable package temps are around 60c. Download and install HWMonitor (non pro version), Prime95 (the stress tester) and CPU-z (reports hardware and bios settings).
Big piece of info you left out: What are you cooling the CPU with? Also, what is the make and model of your case? Need to know that so as to get an idea of the ventilation characteristics. Keeping things cool is essential when overclocking.