Origami books of this kind are more of a can you do the patterns as much as a read book. So I did both, most of the patterns are readable, but would benefit from a few extra steps being shown on the more complicated ones.
The book has some beginner level folding but most is intermediate, and some advance- as you need to intuit some of the three dimensions coming together.
A really great book on making boxes though. Lots of variation!