Aside from sticking to a full dose of Epsom Salts twice before and twice after the flush( or 800 mg of Magnesium Citrate, that's what I prefer to take), I think taking Gold Coin Grass for at least three weeks before a flush is a very good idea.
In fact, you may want to stick to Gold Coin Grass for a while longer. I have been giving Gold Coin Grass to my mother (now 93) for abt 2 1/2 years straight. Her gall bladder is full of stones, she had been to hospitals several times with extreme attacks. They don't dare to operate ( she has also heart problems), and I don't dare suggest a liver flush, althouh I have done many myself. With Gold Coin Grass she improved, but still had occasional mild attacks. We then added Coptis and Curcuma for a while, all three tinctures from the same place. She has been totally free from attacks for all of this year!