What was your experience with self-publishing?

I recently read Write Useful Books by Rob Fitzpatrick. It was awesome and totally inspired me.

Are there any indie hackers who have experience with self-publishing?

What did you write?
How did you publish it?
What was the result?

I'm sure there are other hackers out there who love reading and dream of writing, too. Please share your stories!

PS I would love to hear stories that aren't about monetary successes, too! There's always something to learn. 🧠