Years ago - during perimenopause & hot flash days - I decade myself this way. I started with a bag of my regular brand of coffee & then as it went down to about 1/4 of the canister - I added decaf. When it went down another 1/4 -I again added decaf. This transpired over a couple of months - over & over until I was certain there was only decaf in there. And I drank decaf for a lot of years. Until I read that a bit of regular coffee helps stave off dementia. So I went back to regular over time. But I'm pretty happy with this 1/2 decaf set up. :) Good luck!