Before finding Nolan's lessons, about 6 months ago I was naive enough to believe that i can watch few YouTube videos, get the same tools the instructors use and create the same effect

In such effort I tried to draw my dog Dobby.
Here is his original
Here is how I drew freehand.
Then I realized how hard drawing with indenting it and creating indiscriminate indenting with a metal tip can be disaster. Specially when you don't know the pattern of indenting. Nolan's course is so methodical and explains how the desired effect is achieved.

Nolan