here goes nothing

used to express a sense of uncertainty or nervousness before attempting something

The idiom "here goes nothing" is a phrase used to express a sense of uncertainty, anticipation, or resignation before attempting something, especially when the outcome is uncertain or potentially risky. The origin of this expression is unclear, but it is believed to have emerged in the early 20th century.

Before stepping onto the stage for her first solo performance, the nervous singer took a deep breath and muttered, "Here goes nothing.
With a shaky hand, he inserted the key into the ignition of the old car and whispered to himself, "Here goes nothing," hoping it would start.
After weeks of preparation, the entrepreneur clicked the "Launch" button on their new business website, saying, "Here goes nothing.Let's see if it takes off."
Standing at the edge of the diving board, the hesitant diver murmured, "Here goes nothing," before taking a leap into the pool.
Holding his résumé, the job applicant entered the intimidating interview room and quietly said to himself, "Here goes nothing," as he sat down to face the panel of interviewers.