To do the dinosaur, I started with a simple model of a standing dinosaur, duplicated it, and dragged the tail, neck, and legs into new positions. I had to do a little re-sculpting and if I was trying to make a nice model, it would have taken a lot more time, but with this really rough model, I think the whole thing (including adding the dragonfly) only took about a couple of hours, and part of that is because I'm still learning the program. You can also add layers to the models with the changes so they are non-destructive but I've only played with that a little.
The best thing about having it on the iPad was that I did it while watching TV with family.
I will definitely check out the book.