How does one ween themselves off of caffine/coffee?

Years ago when I was younger I would go a day or two and get a massive headache and then be off coffee. I don’t think I can go that route now as I am a migrane sufferer and I will be having brain surgery soon and I have been told that I will have an awful headache from that and brain swelling….So I think it best to try to eliminate part of that now, since doc said I wont want to eat or drink for several days after the surgery, I’d rather go through withdrawls now and not then, so do I cut back on a cup a day or 1/2 cup each day or 1/4? I drink about 3-5 cups per day, I just don’t want to go through the big headache withdrawl. Thoughts?

Reduce it by half the total the first day and then gradually work down from there. Of course if you went cold turkey it would be over sooner but you will have headaches over it and want to sleep. If you insist on having coffee then you can switch to decaffeinated coffee. It actually still has some caffeine but you can switch over to it, and then substitute something else. I just found out Postum isn’t made any more so I don’t know what you would substitute for it. A lot of chinese people just drink hot water, you could do that.