Edit: Well that turned out to be quite the book. Sorry about that!
When approaching caffeine reduction, I think it’s a good idea to know why you want to do it; meaning, what type of benefit are you looking for or what kind of side effect are you trying to get away from. This is where your motivation and drive will really be housed.
Knowing exactly how much you take in will help with a taper. So the size of the pot matters, the roast type (the darker the roast, the less caffeine), how much of the grounds do you use, etc.
Your lifestyle will make a big difference in how you may want to approach this. If you have the ability to take a weekend to rest and deal with the worst of the withdrawals, going “cold turkey”, or “partial turkey” if you’re just wanting to cut back, might be the way for you. This is often the faster, though more miserable option. This is also assuming you don’t have any issues with caffeine where your withdrawal causes serious physical or emotional issues, for example. The “majority” of people have the same type of symptoms, but there are people who are strongly affected by removing it from their life.
If you want to simply cut down and do a taper, there are some options. You could reduce the grounds before you brew. If you did that, you could replace the missing grounds with decaf if you feel like that would provide too “watery” of a result. You can also cut back on the amount of coffee you drink. Say you drink an 8 cup pot on the regular, so instead you might cut back to 7.5 cups, then switch to drinking water. You will have some unpleasant side effects, but reducing bit by bit should help.
Honestly, I would keep track of how much coffee you drink every day for a week or so in order to really know what you’re taking in–this would include having a better idea of how many grounds are being used before brewing. Once you have this data, you can make clear decision’s an how much to remove. Of course, you don’t have to do that, this has simply always been my favorite approach because in involves more concrete numbers within which I can actually know what I’m doing.
There are also other ideas like moving part of your coffee consumption to tea that you can read about in past posts in this thread. There have been a lot of people who have tried different things. You can post in this thread as much as you need, if you find it helpful.
Good luck to you if you decide to give it a go.