Laptop Graphics Upgrade

I own Sony Vaio FS215-B which uses integrated graphics and i would like to upgrade the graophics to the NVIDIA Geforce Go 6200 found in the model above (FS215-M) My computer and the model up are identical except for the graphics and larger hard drive so my question is if i get my hands on the upgraded graphics card and i open up, plug in, change bios settings and install drivers.....? Is it easy or will i run into problems?

Also anyone knwo where i can get hold of this sort of laptop graphics card on the cheap?

 

Your graphics is not replacable, some of the new laptops have video cards, but from the specs that i read yours has the intel graphics. I guess you might as well like them, its all you got. ed