Buy a pig in a poke synonyms

What is another word for Buy a pig in a poke?

• take a leap in the dark
• catch at straws
• live in a glass house
• go to sea in a sieve
• lean on a broken reed
• burn one's fingers
• put oneself out of court
• play with fire
• back the wrong horse
• bark up the wrong tree
• go out of one's depth
• gamble
• take a chance
• take a risk
• leave things to chance
• speculate
• venture