I began by using a mix of regular and decaf coffee in the morning. Eventually just working my way to all decaf. The soda I did the same way. Started drinking some caffeine free and some regular. Just worked my way down to all caffeine free then started adding water and worked my way to all water. I had stopped my caffeine habit before and I did it cold turkey. The headaches I had were excruciating. Removing it slowly worked best for me.