摸不着门儿

Traditional (Taiwan): 摸不著門兒

mōbùzháoménr ㄇㄛ ㄅㄨˋ ㄓㄠˊ ㄇㄣˊㄦ

    • to be unable to find the way to do something
    • to not get the hang of it

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
can't find the door by touch
Meaning
Can't find the way or method to do something; can't get the hang of it.

Sources