In a laptop, overclocking will be limited by cooling. You can use Afterburner to overclock. You might gain 5 - 10% increase in performance. As you will not be able to change GPU voltage since it would be locked, there is no way you can damage the GPU, just keep an eye on temps and keep increasing core clock until it becomes unstable.
Also, replace your HP stock thermal paste with something better. Discrete GPUs in laptops always fail from solder cracking due to large variations in temps (90+ while gaming, ~30 while idle). I had my previous laptop fail on me this way. Now I always replace the stock thermal paste after 2-3 years.
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