I'm a very visual person so I love these tutorials. I think for the beginners take what you see and just experiment, watch the first video then just play around with the software. I am a beginner as well, I've never used PhotoShop so to have something this advanced is very exciting to me.
I am a professional photographer and use Lightroom for my editing and will still just because I like the flow of it a bit more, but its limited to just that, now I can do so much more with my photography. I've spent hours during the beta playing with it and haven't even touched the surface of what this software can do.
Being a glutten for punishment I also purchased designer, I've got years of learning ahead of me but thats what makes it fun for me, knowing theres always more to learn.
If you still think its to much try Pixelmator, its a much more basic version of what is packed into this.