First, the daily life of the librarian.
To tell the truth, the professional treatment of librarians in China is not good. Under normal circumstances, the salary is only about 3K, and some libraries only open a little more than 2 K. The librarian's job is basically to sort out books every day, rearrange the books of people who read yesterday, and then classify them, especially when new books come. Classification work must not be sloppy.
Doing these is cleaning, dusting the bookshelves and patting the dust on the books. If the weather is fine, take those old books out to dry. If some libraries sell books, they also need to act as shopping guides. Guests come to entertain guests. Basically, the shopping guide only needs occasional guest appearances. Nothing, you can read some books you are interested in or play with your mobile phone. As long as you are in the library.
Librarians don't need extensive knowledge, but they need to know something.
Librarians don't really need extensive knowledge when classifying books. Because when the new book arrives at the library, the people on it will give you a classified list, and you can do it according to the classification on the list. You don't need a wide range of knowledge, as long as you can read it. If you have a wide range of knowledge and can classify each book by yourself, then I don't think the job of librarian is suitable for you.
Your ability is suitable for a better job. The knowledge you need at work is probably when you recommend books to your guests. Many guests come to the library and need your recommendation before you use them. But it doesn't need extensive knowledge. Just read a few good books. Moreover, the treatment of librarians in China is too poor. In fact, they also know what kind of people to look for when recruiting themselves, and their requirements for knowledge are not high.