It's like trying to pin the tail on the donkey without any clear instructions.
Это как пытаться найти решение наугад без каких-либо ясных инструкций.
Definitions
A party game in which blindfolded players try to attach a paper tail as close as possible to the correct spot on a picture of a donkey. The phrase is also used metaphorically to describe attempting to complete a task with limited information or while 'in the dark.'
