like nailing jelly to the wall

like nailing jelly to the wall

Incredibly difficult or impossible, such that it could be seen as a foolish or worthless endeavor to attempt. Trying to have a reasonable debate with her father is like nailing jelly to the wall. If they can't secure a victory here, climbing back to spot in the finals will be like nailing jelly to the wall.
See also: jelly, like, nail, wall