Is preparation necessary?

I am going to flush 'cos I am suffering from the gallstones. I want to following the most popular recipt in this web:
//www.curezone.org/cleanse/liver/huldas_recipe.asp
But I noticed it need a preparation that I copied in the bottom.
Can anybody tell me, is this preparation necessary while I want to flush my Gallstones out?
One more, is the walnut drop necessary in the flush.
Thank you.

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Preparation

You can't clean a liver with living parasites in it. You won't get out many stones, and will feel quite sick. Zap daily the week before, or get through the first three weeks of the parasite killing program before attempting a liver cleanse. If you are on a parasite maintenance program, do a high dose program the week before.
Completing the kidney cleanse before cleansing the liver is also recommended. You want your kidneys, bladder and urinary tract in top working condition so they can efficiently remove any undesirable substances incidentally absorbed from the intestine as the bile is being excreted.
Do any dental work first, if possible. Your mouth should be metal free and bacteria free (cavitations are cleaned). A toxic mouth can put a heavy load on the liver, burdening it immediately after cleansing. Eliminate that problem first for best results.
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