little knowledge is a dangerous thing, a

a little knowledge is a dangerous thing

proverb Having a precursory or limited amount of knowledge about something can make one overestimate how well they will be able to do something much larger in scope or scale. Just because she painted her room by herself, now she thinks she can do the entire house—inside and out! A little knowledge is a dangerous thing, I tell you. Does he seriously think he can represent himself in court just because he went to a few semesters of law school? Hoo boy, a little knowledge is a dangerous thing. A: "Allie has only driven a few times during the day, but, now, she wants to borrow the car all the time, even at night." B: "Well, a little knowledge is a dangerous thing."
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

little knowledge is a dangerous thing, a

Also, a little learning is a dangerous thing. Knowing a little about something tempts one to overestimate one's abilities. For example, I know you've assembled furniture, but that doesn't mean you can build an entire wall system; remember, a little knowledge . This maxim, originally a line from Alexander Pope's An Essay on Criticism (1709), has been repeated with slight variations ever since. It is still heard, although less frequently, and sometimes shortened, as in the example.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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