My mother has completed two flushes to date with fantastic results. The protocol she decided on was a build-up over two weeks time using the gradual method, then she did a full flush (Clark). Prior, she was having tremendous gall bladder/Liver issues. She is now feeling MUCH better...no surgery!
BTW-she also did several coffee enemas which helped to relieve pain and release pressure in the Common Bile Duct...this might be helpful for you while on your cleanse vs. doing the whole flush.
I always feel better after a coffee enema...nothing like french roast in the morning! :-)