I decided to upgrade the memory in my Macbook Pro from the standard 2G to 8G. I purchased the memory upgrade kit from crucial.com for £35.
The base of the case is fastened on by some very small cross point screws.
The original memory prior to, and after removal. Note that the memory is stacked one on top of the other.
The new memory next to one of the removed original memory.
One of the new ones inserted.