Yes, it's okay. The question is, how effective is it? Dust can stick really badly to fans and other parts.
I'd check on youtube for somebody else opening the same model of laptop. It's usually not that hard.
As long as you're careful and don't use excessive force, you should be fine.
All actions in life have the potential for unintended consequences. That includes opening it up.
Edit: If you are able to understand English then you would have understood that I DID answer your question.
Since I am the only person who answered after almost a half-hour, you should be more appreciative. I'll attribute your poor attitude to you being a teen.