I have a late 2009 iMac 21.5in 3.06GHz. I've ordered some RAM to upgrade to 8GB as I find it is running slow when I have a few apps open at once. But I've also noticed that it's sluggish when gaming on the current graphics card. Are they relatively easy to upgrade? Could I do this myself or should I ask Apple to do it for me? Has anyone swapped out their graphics card on a late 2009 model? Thanks.