5 - 30 minuten
My daughter had outgrown her 200GB harddisk. I got her this 750GB replacement. Also doubled the RAM size. Now things move much faster, both because the machine is faster, but even more because she does not have to fuss with external hard drives for auxiliary space, and carry those drives with her.
As I was replacing both HD and RAM at the same time, the first three steps of the your two sets of instructions were the same. I had to spend some time establishing that this was the case (reading very carefully). You might think about supporting this sort of merging of instructions and procedures.