Hello There!
I am a voice-over/actor who does not only have a wide background experience with providing raw narration, but also dealing with editing raw audio myself.
Using the free program of audacity, I had to edit, remove background/unwanted noise, equalize, and render high quality audio for tons of Audible narrations in the past. Which exceeded more than 2 and a half hours.
Reading the instructions, I can definitely take care of all of that extremely quickly.