If you learn from doing it and enjoy the experience, it's not a waste of time. And if you work at your craft long enough, eventually you'll be the person who can do it better than other people can. But that doesn't come quickly or easily.

For inspiration, read Peter Norvig's article, "Teach Yourself Programming in Ten Years":

https://www.norvig.com/21-days.html

In particular, see the paragraph that begins with: "The best kind of learning is learning by doing."

(Norvig has had a long career in computer science, and is currently a research director at Google.)

Also, if you build a tool for yourself that makes your job easier, it will be a lot easier to customize it to your needs than a tool built by other people, who have different priorities.