I can remember that the first time I was pregnant, I went right off coffee - and I used to make a large jug of coffee each morning that held 8 cups, put it in a flask and it was empty by lunchtime if not sooner!
I just went cold turkey and it wasn't until I saw my doctor for my monthly check up that I mentioned the headaches and we worked out it was due to the lack of caffeine!
I suppose that going half and half, caffeinated/decaffeinated coffee could possibly work but you would need to be strict in lowering the amount of caffeinated you are using.
Don't forget that some types of soft drink also contain caffeine .
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.