You'd never believe it, but these are so simple to make, they just take time. It is the perfect book for beginners in modular origami and encourages one to ask for more.
The instructions are clear, simple and large. Initially I would recommend using slightly larger paper because once you get to the smaller paper you need quite a bit of dexterity and a lot of patience to fit everything together. Some modules require triangular paper which they tell you how to make from square paper, but although this takes time, they are really impressive.