Alternative form of don't teach your grandmother how to suck eggs

(idiomatic, often humorous) Somewhat sarcastic but usually good-natured advice used to criticise a person's degree of talent (especially in music or other performing arts), implying that he or she could not make a living from it.

(informal, humorous) Your mission or task; what you must do.

Alternative form of you don't dip your pen in company ink

Rather than feeling nostalgic or sentimental, one should simply accept any place where one happens to reside as one's home.

(idiomatic, humorous) Used to indicate that someone is being unreasonably bossy and demanding.

Alternative form of you kiss your mother with that mouth

Alternative form of you don't dip your pen in company ink

(computer hardware, Internet) Using a Molex-to-SATA adapter to power a storage device may lead to loss of data, as a poorly designed and unreliable connector may cause damage by failing in an unsafe manner.

A person's perceived skill or competence is determined by their most recent success or failure.