If you plan to read out long streams of dialogue..
...I suggest you either split it up into smaller clips, or script down what you are going to say. You sounded quite hesitant - I counted 11 "umm's" and "err's" in the Basic section alone, and I didn't count stutters or short silences. I can estimate that you will probably "umm" and "err" a further 30 times, but It'd take a long time to count...
The tutorials were quite useful and were certainly in-depth, but I did at times find my self dozing off during some of the parts.
The diagrams were fairly useful in most cases though.