Would it ever be possible to upgrade the graphics card for my Samsung laptop?

Technically I heard it is, it’s just that:

1) You have to really know what you’re doing when you open the laptop

2) It might be a bad idea anyway because laptops aren’t meant to have a more powerful graphics card because of the greater power needed to cool it down.

That’s pretty much what I got after looking things up.

I mean, the VERY LEAST I need in video memory is 512 MB, and I currently have only 64 MB. Would a video card that’s at least 512 or 1,000 be too much for this to handle?