That's a whole lot of production work that went into a video version of a symbol chart. It doesn't really say anything about how to read schematics. Basic conventions, like "signal flows left to right" and "positive up, negative down" are not mentioned at all, as well as good advice for understanding circuits. He doesn't address at all how to understand that big schematic he shows. What's the use of being able to read it and assemble the circuit - don't you want to know how it works?
I'd start with a couple basic suggestions - break the circuit into logical blocks, and try to find paths. Look for a main signal path, find feedback paths, etc. Figure out where the signal goes. Then try to identify common subcircuits, like the inverting amplifiers in the example schematic, for a better idea of what it does. Go from there, and do all you can to learn about common circuits that you might encounter in a schematic. Op amp circuits, transistor circuits, etc. There's nothing anybody can say that will make you understand a complex schematic if you don't have the experience and knowledge to know what its parts do.
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