You guys need to actually change the resolution of the video itself, not just switch to full screen. In the bottom right of the YouTube player you'll see a few icons, click the one that looks like a "gear" and you'll get a pop up menu with different video resolutions on it. Default for YT is 360, which you won't be able to read, when you full screen it the video might change to 480 but that's still goign to be blurry. For somethig like a screen capped tutorial video you're probably going to want to use 720p. It'll take a lot longer to stream the video, but you can in fact read everything on the screen. The text still won't be perfect, but it'll certainly be readable at least [click the image to get an idea of how it'll look].

 

So far as video tutorials go, I generally don't do well with them myself. Simple ones that are just a matter of getting an overview of something are fine, but one you actually need to follow along with, I get lost on. I think you need a dual monitor set up for those, or a laptop/desktop, so you can have the video up on one screen, and work along on the other.

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