Charlene Schurch has written numerous articles about knitting for Piecework.
The 2 flaws I find in the book are inadequate information about blocking and some gauge issues. Most wool hats need some blocking to look professionally finished, especially tams. You'll get no help from this book. The gauge problems are more troubling. On the Komi cap, for example, it calls for fingering weight yarn at 10 stitches to the inch (didn't specify which needles). Well, I'm a tight knitter and I could only get 8 to the inch on size "0" needles. I ended up having to reconfigure the child's sized hat (stitch count) for an adult head taking into account my altered gauge. That worked and the hat is gorgeous. But do be warned that gauge is everything in hats...if you can't get the right stitch count per inch (and that's not easy with this book) the finished product might not fit anyone's head.
Probably the best feature of this book is that most of the patterns include directions for many sizes, from toddler to x-large adult.
There's also a full range of difficulty from multiple color and intricate colorwork to 2 color stockinette or simple cables. Although all of the patterns involve either colorwork or cables, the projects are small and the charts are easy to read, making this a good book for the knitter ready to move beyond scarves and other simple knits.
I found my knitting gauge to be up to 2 needle sizes off from the directions so I would strongly suggest not skipping your swatch!
I like how the author doesn't specify the brand of wool she used, and instead gives only weights and measurements (ie worsted weight and 210 yards per 3.5 g). This allows for you the knitter to substitute your own wools without the fear that your project won't turn out exactly the way Charlene's has. Her directions are straight-forward and include various ways to cast on. She writes in a chatty style but free of bells and whistles. However, if you do not know how to read lace, Aran, or colour charts then you are at a supreme disadvantage. Most of her directions are sparse, and you must rely on the chart for the pattern details. Again, if you are a real beginner, this may not be a book that you want right away.
One of my favourite things about this book is that it includes all sorts of different styles. So there are tocques, earflap hats, tams, and watch caps - something for everyone and never a moment's boredom as a knitter.