Both...it is definitely easier on the Miracle-Mineral-Supplement , but still takes willpower. Listen to your body, it will tell you when it doesnt want the yeast stuff anymore. Always listen and go from there.
I was not very good at the willpower thing either, pretty rotten in fact. I found that if I tried to force it through willpower, my experience is that I usually got a backlash that ends up in a roller-coaster situation.
A couple of very important keys to this part of the puzzle are the drinking a ton of water, and adding in a lot of greens. Everyone can drink, and with a little practice, they can drink a LOT. This adds super hydration, and super nutrition and chlorophyll. All of this helps in "rinsing" the blood, and rebuilding it. Chlorophyll is especially good for this.
So, make sure you try to add these pieces in; if you still find that your body is not responding, you may need to increase the Miracle-Mineral-Supplement , but do it slowly and stay at the next step for a while. Also, you may need some additional supplementation, mineral and maybe vitamin, for a while.