I believe that taking the ES prior to the flush is a great tool to minimize any potential complications.
You've done a solid preparation in advance and the ES will take you all the way for a good flush.
With all the preparation youve done, a lot of stones may be ready to come out, and the ES will make sure the ducts are relaxed to prevent them from getting stuck.
ES flushes the intestines as well and a prper Bowel Cleanse before and after the Liver Flush will maximize benefits.
Mike