If you know how to do it, then do it... but most likely your
graphics is integrated, hardly any chance to upgrade it unless you
rip the whole laptop apart.
For RAM, it shouldn't be a problem, only thing is getting the right
RAM. Usually you just need to unscrew the back of the laptop and
you will be able to see the RAM. Quite a few shops here do sell
laptop RAM, remember to check your laptop manual for the right type
of RAM.