I find that going off caffeine is best done all at once, rather than by cutting back. That just spreads the misery out. However, by going cold turkey, I find that I'm essentially fine on the third day, actually feel noticeably better by the fourth or fifth day. I've done this about 10 times in the last eight years, for various reasons, but the main reason I continue doing it is that the effects of caffeine rapidly dwindle to "normal" for me over a period of weeks or months, and the only way to get the pick-up effect again, that I've found, is to drop it entirely and start over. It's fortunate that this is so easy. :)