You should not apologize for asking for information about a process that is not easy, and with which, if someone makes a mistake, you will be the hardest hit.
Maybe the photos of a case in which I worked can help you see things a little clearer.
The first photo was taken right after a session in the beard density reduction work. I think you can see the area where the session was interrupted (higher hair density).
Here in more detail:
This was the original density, before the start:
This man's beard was fully developed when the process was carried out. The hairs were incredibly thick (as I had never seen or worked on). In my opinion the redesign of the line under the cheek, as well as the neckline is too low and too high, but that's the customer's choice, therefore, it was done as he wanted since it falls within the aesthetically acceptable.
I'm not going to lie, this is not an EASY job, neither for the client nor for the practitioner.
Another moment of the process. In this area, all hairs were treated and permanently removed: