That’s the formal instructions. The actual process, if you have all the tools, boils down to this.
If you recorded well in a quiet, echo-free room, you may be done.
If you think you are done, ACX has a way to post a short test. It’s not a good idea to crank through a whole book and only then find out you made an odd but serious mistake on all the chapters.
https://forum.audacityteam.org/t/acx-check-stopped-working/57093/5
Koz