Question : Problem: Changing harddrive and ram on MacBook 13" (unibody)

I'm thinking about buying a MacBook 13". I would like to know if I can change the harddrive and ram myself, and if that doesn't void the warranty. Is this easy to do? I can find manuals for the black/white older MacBooks, but not the new ones.

It seems that buying extra ram and a harddrive are as cheap as or cheaper than doing it right away. So I might as well do it later.

Answer : Problem: Changing harddrive and ram on MacBook 13" (unibody)

Those video's are for the older types. I'm talking about the new ones, out december 2008. I found the following video about replacing the ram. It seems like replacing the harddrive is even simpler, although it's not shown in the video.
http://www.youtube.com/watch?v=rY2LC6JKZ4k