[Python] How should I implement Fuzzing techniques presented in "The Fuzzing Book"?

I am currently reading "The Fuzzing Book" and I am trying to determine how I should apply or implement the fuzzing techniques that I have learned from the book. For instance, in the book, they describe "coverage" and further expand on that idea by coding a coverage tool. Now my misunderstanding comes from not being sure if I should attempt to write my own coverage tool, as they have in the book, or if I should use the "coverage.py" Python module.

Overall, I am asking advice on how I should apply the knowledge acquired from "The Fuzzing Book"? Do I read the book and attempt to implement my own tools or can I use prefabricated tools available for everyday application development?

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