Unlike desktop, you can't easily put fancy cooling system on your processor. If you do that, you better buy a desktop because with fancy cooling installed your laptop can hardly go anywhere.
So overclocking laptops is a very bad idea. It burnt my motherboard, but luckily I have warranty so make sure your warranty covered if you want to experiment with overclocking.
As an electronics engineer I can tell you this for a fact - if you are not sure what you are doing then do not try overclocking your processor.
I say this not because that over clocking is dangerous (although it certainly is) but because most people don't really need to overclock. All they need is to close down the useless processes on their PC and usually their requirements are met.
What happens is that after getting deep in BIOS people just sometimes make mistakes that they are then not able to get out of by themselves. If you must overclock then its better not to do it to a laptop. Do it to you Desktop computer - the one that is literally on top of the desk. They are much more robust than laptops and usually have much better cooling as well.
Over clocking cause more heat and it also need more power. Therefore, it need more powerful cooling system and better power supply module. Laptops doesn't have extra space for extras. Based on that criteria, laptops is not advisable to overclock but if you wish, do it on your own risk.