I used to be addicted to Coke (the drink), and some other carbonated drinks. I noticed I feel much healthier not drinking it, and when I do sleep, I sleep for much longer than what I would have managed if I were drinking it.

Just replace caffeine with another favourite/preferable drink, which doesn't contain any. I picked orange squash and water, and drank loads of it, because I noticed I was getting a lot more thirsty in the early stages. From the start, I didn't touch caffeine at all.

Shorty came some headaches, but you can shut them up for a while with paracetamol, other drinks (water), and lots of sleep (and you'll sleep much better after a week or two once you've started quitting).

If you're having a hard time, don't do it my way, and just pace yourself. Maybe limit yourself to one cup a day, and slowly move into every other day, and so on to how you see fit.

Also, good luck! ^^