The ES usually will give you buttpee. The shakes sounds like overkill.
My personnal view is I like my bowels to be empty (and not filled with fiber), so I only have watery BM's so it is easier to see the stones floating. I am not interested in BM-digging.
As it is I use Oxypowder
or 1 tsp Epsom Salts
the 3 night before.
This is just what I do, other people might do different things.