The painful way is pretty simple! Wait until you have a few days you can be "down" and just go cold turkey. I find I do OK the first couple of days, then get a pretty bad headache. When that's gone I'm back to normal.
This. The withdrawal symptoms of coffee usually last for about a week. The thing that is perhaps most surprising is that after that week you'll also feel less tired. Turns out that while most people consider coffee as a remedy to tiredness, it's the coffee itself that actually makes you more tired, so you need more and more of it, just like any other addictive drug.
Caffeine is a mild stimulant, but in the evening the main effect is probably blocking your adenosine reuptake sites. https://en.wikipedia.org/wiki/Caffeine#Pharmacology You can probably get a similar effect by drinking a small amount of caffeine in the early afternoon instead of a large amount in the morning. I mentioned this in another comment, but slowly decreasing your caffeine intake over time lets your body adjust with pretty minimal symptoms.
green tea matcha is a good alternative. 1 cup of green tea matcha has 1/3 of caffeine as a coffee cup. Since it is packed with L-theanine, it will also delay ingestion of caffeine, and you will feel less the typical crash
It will suck a lot for a few days, bad headaches, might even throw up. For me, I was in slowmo for about a month. I normally work on stuff when I get home and for about a month I would go home and just sit around. After that I was over it and feel much better because of it. This was going from drinking 4+ of the Mexican Coca Cola bottles each day. That stuff is just a trap.
I gently titrated down by replacing coffee with a pre-workout drink (powder mixed in water). This allowed me to tightly control my caffeine intake and reduce it gently every few days until it was almost zero. I have been off of caffeine entirely for almost 15 months now. It has really improved my sleep.
Try cutting down gradually, eventually getting to a single cup in the morning. Supplement with decaf. Then just decaf. I've found I miss coffee more than cafeene now so I still drink decaf. Difference is I can sleep and don't feel the awful stress anymore.
