How can I change from LIB and jar in the project to Maven for management?

It turns out that I should have used Maven last year. I didn't catch a cold with Maven at that time (please don't bother). Why should I use Maven for management, I managed the jar by myself. At that time, I felt that it was also convenient to manage the jar by myself. I also listed the following disadvantages for Maven:

1. install other tools (APACHE-Maven)

2. You need to learn the cost (I was thinking about learning this. Why don't I spend time looking at other technologies)

3. Dependency on IDE

4. I don't know where to start when I encounter Maven environment problems (I thought about why I was working on the environment all day, so I can do other things without such a problem)

The above is my opinion on maven last year, so I used manual jar management when I was working on the project, and then there was a problem.

How can I change from LIB and jar in the project to Maven for management?