I have a Pangolin value(purchased in march 2008 ). I have 320gb SATA hard drive on order. What do I have to do to change out the hard drive? Will I void the warranty?

I also want to clone my current hard drive over to the new 320gb HD. I have an enclosure for the hard drive. Also is it possible to expand my root partition and not destroy other data?

How do you go about removing ram and adding larger capacity sticks? Will that also void the warranty?