How easy is it to install RAM into a new sony vaio...

Question

hi there, got a new sony laptop. has 1 GB ram (512 MB * 2) .
What tools will I need to install 2 GB RAM( 2 dimms) (DDR2 PC-4200
Memory) ? I was thinking of buying the stuff from the net and then
install myself. Is it recommended to install myself OR pay more and buy the RAM from bestbuys since they will install the RAM themselves ?what are the risks of installing myself ?Thank you,BR,~A