I don't really plan a card but when I'm at work and it's quiet I might start thinking of what I could do, and if I think of something I jot it down on a bit of till roll!! I have so many bits of paper lying around I need a day or two to try them out! Or a filing system to put them in some sort of order!
I find I work better under pressure, those times when I suddenly remember a birthday the next day, I just seem to get on with it.

Sally