Remember those days when overclocking the CPU was considered dangerous and only a few people would even attempt it, and those people were treated like gods? Not anymore. Anyone can overclock their CPU if the CPU is overclockable and necessary hardware is available. Getting a modest overclock is easy, but if you are trying to squeeze all that extra juice from your CPU, you might need more than just luck.
Overclocking is not dangerous if properly done. Know your limits and obey by those limits. For example, don't insert a lot of volts to the CPU because it will damage the CPU. Keep it within the manufacturer recommended/commonly accepted volts for your particular CPU. Also be wary of the temps of the CPU as well as other components like VRM heat sinks of the motherboard.
Here are some tips.
1) Prepare a separate environment for overclocking if possible. If you have a spare drive lying around, install a free copy of Windows in it and don't install anything else - not even Windows updates or driver updates. Why this is important is because when your OS crashes while stress testing because your overclock is not stable, it can corrupt the files and settings and that alone can give a BSOD when you stress test with different settings the net time. You might think the CPU is unstable, but in reality it could be a corrupted driver or corrupted software that is running in the background.
2) Stress test for a couple of hours at stock settings. This will rule out any issues that might be present in the original hardware. No point trying to overclocking broken hardware. You'll only waste your "precious" time. Running Prime95's blend test should do the trick.