Julia has said take the GCG for a several weeks, then switch to CB 7 days before the flush to dredge the liver a bit before the flush, to help the liver produce more bile and such.
That was totally opposite to my thinking, which was to keep dreding the liver in between flushing, then dissolve the stones immediately prior to flushing, since they could conceivable harden up again as they sit there.
Either way, at least 7-10 days of stone softening protocol will ensure a very successful and painless flush.