cart before the horse (to put)

[cart before the horse (to put)] {n. phr.}, {informal} Things in wrong order; something backwards or mixed up. - An overused expression. Usually used with "put" but sometimes with "get" or "have".

When the salesman wanted money for goods he hadn't delivered, I told him he was putting the cart before the horse.

To get married first and then get a job is getting the cart before the horse.