I have mine overcloked. Just make sure you keep the exhaust ports elevated so the fans can suck in air. That's how mine stays cool. Ambient temperature helps too
As long as you monitor your hardware youre fine. Most hardware will thermal throttle itself anyways. Maybe prop the laptop off the desk or get one of those cooling pads with fans built into it. But unless you're a total moron you shouldn't damage anything.
You should never overclock a laptop, most laptops run hot as it is, increasing that will not end well and will actually damage components and possible kill your laptop after a while. If you want more performance get a desktop and then go from there
remember you can actually mess with the solder on your board when you overclock a laptop. I found this out the hard way a few years ago. They already run hot and OCing it only made it worse. it got to the point where the machine wouldnt turn on unless i reset the solder every time it cooled down.
I overclocked the 1070 in my Alienware an extra 100mhz. This laptop has really good cooling though, plus I have an elevated laptop cooler underneath. It works just fine for me. I wouldn't overclock it as much as you would in a desktop though.