To be serious for a minute though (and it is a bit difficult for me to be totally informed, but from what I experience with my 8 month old twins and seeing other people).
I would say that if you expect to have time to yourself at all then it will be difficult, but if you are prepared to just be with them like a full time job and get involved with tasks it should be manageable – if it is bad weather then make cakes, get them to invent games. I spent some time with a friend's little girl at the weekend on this one – stick them in a play hut and tell them they have been flown to a new world then when they come out they have to imagine all the things they can see and go exploring together.