I encourage all authors to self publish. I self published two books, prices are $99 and $199. I only sold 2500 copies in 3 years but it's a nice supplement to main income since there is no publisher and only fee is Stripe's. I often read online about authors who sold 50,000 or 100,000 copies with big-name publisher but made less money than me. Which is ridiculous.

I recommend having some knowledge for free, for example, open source project. Charge more per copy and expect lower number of sales. Continuously improve project and book. Collect reviews in respectful way.

I am happy to answer any questions.