Harder than herding cats.
harder than doing something with a wet noodle and a wildcats .....
Old dutch friend of mine , sadly no longer with us, used to say whenever involved in a dispute with employees, builders, inspectors or general busybodies (in a thick dutch accent)
" Vell zats ze vay it's going to be, and if you dont like it, you can all FOOOOK OFF"
He usually got his own way, and it usually turned out that he was right in the end too!
Those who know me will know who I am talking about.
Phil