Just read the book. I suggest this to any budding comic artist out there and even those who been doing it for awhile but want to have a speedier production process.
This book helps with two of the most major problems I have seen and I have dealt with drawing comics-Perspective and backgrounds(buildings, cityscapes). Using photoshop the author provides you with an easy method to map out any perspective you need. BAM! That like leaping over a tall building as a comic artist. But no more trying to figure this horizon line and using a ruler to do this and that(free on his site-http://www.freddieart.com/quicktools/index.php?page=detail&get_id=1&category=2). It's simple and effective. The book has Hybrid methods so you don't have to go completely digital and just use the perspective grid and do some digital roughs and then print it out to do finished pencils and so on.
Plus the author shows you how to take scanned buildings and transform them into different buildings you can cut and paste and form. That eliminates the tedious drawing building after building burn out, especially if you draw superhero comics. And you can get the free http://sketchup.google.com program where you can create 3D models and transform them into whatever you need.
Now do you still need to know how to draw? Yes and No. If you've been at it for years and know some photoshop then you'll be able to pick up the info in this book fast. If not, you can still learn how to get where you would like to go as a comic book artist fast, because many painstaking methods have been removed to do great art. This book is about Mastering time and that is something I'm all for. In a year I'll start my own trek into digital drawing, but maybe even sooner.