As long as your careful and double check your work this will be a relatively simply job. :)
1) No. The cooker will be on it's own circuit designed for the cooker only.
Number 2 is the easiest and safest way. Would it be possible to remove another knockout from the double socket, giving you...
I'm going to be installing a lighting switch and a few sockets around the house, what size of mounting box do you recommend I use for the switch and the sockets?