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Shows the step by step of the modification, in a simple way, without getting into the theoretical issues too much. Pretty much hands-on.
However, the incredibly poor quality of the video (and audio) play against it, although it doesn't affect the viewer's understanding of the theme. Also, it lacks some fundamental aspects of adjusting the amp after the modification.
Unless you are absolutely SURE you want this mod and that it will make your amp better, I do NOT recommend it. Otherwise, this will answer most of your questions and guide you through the process. Have in mind that you can only do it yourself with a minimal knowledge in electronics and some equipment (variable voltage source, oscilloscope, etc.)
It deserved a better production, for such an expensive 43 minute video.