From: Mathematics
is it hard to overclock, I mean are there any ways that it could easily go wrong and that I would ruin my pc?
I mean, I might try and overclock my q6660, not the best but I still bott my pc <3
Yes, it's easy. You simply change the multiplier in your BIOS until you get it where you want it. But yes, it can easily go wrong – if you're not careful. If you are careful, it most likely won't. Just go at tiny intervals (.05 to .3 ghz at a time I think, someone please correct me if I am way off here; I can't remember what I did). After each OC, boot into Windows and run Intel Burn Test. Monitor your temperatures with Real Temp. If they get to high, either clock back down, or get a new heat sink. You may have to change voltages to get where you want, but make sure you don't go more than what Intel says is safe (which is 0.85V to 1.5V according to newegg).
You'd be much better off looking up an overclocking guide than listening to me, but those are the basics.