Crucial.com is a favorite of mine. Not always the least expensive but quality and customer service is excellent.
here is the link: http://www.crucial.com/store/listpar...20(All%20Types)
Yes, that looks correct.
You can definitely install the memory yourself. It is two screws on the bottom of the tablet. Make sure the tablets if off, unplugged and the battery is removed. Ground yourself to avoid static before handling the memory.
You do not have to reinstall the OS or any programs. When you turn the computer on it will recognize the memory.