There is not enough success, but more failure
If you can't do a good job, you'll make a mess of it.
Entry
To accomplish something is not enough, to fail is more than enough. Deficiency: there is no way. Failure: make things worse. It means that if you can't do a good job, you make a mess of it. He is a man who can't let go of anything.
source
Zhou Erfu's "morning in Shanghai" part three three: "director Mei's ability is not enough to succeed, but more than enough to fail." Idioms: Jiang Gan crossed the river. Usage: as an object, clause; refers to things getting worse and worse
There is not enough success, but more failure
Grinding a pestle into a needle - tiě chǔ mó chéng zhēn
expect the reality to correspond to the name - xún míng kǎo shí
rectify errors and learn from the good - gǎi guò cóng shàn