It's a good book. After following it, I was actually able to draw a recognizable self portrait.

It also reinforced the point that I have zero talent. The drawing that took me hours of painstaking work is something that my wife could sketch in about 30 seconds.

There is an (apocryphal) anecdote about the person next to Picasso at a corrida being amazed seing him sketch a bullfight in seconds, to which Picasso allegedly replied "Seconds? It took me my whole life to be able to draw this."

I'd wager your wife has much more drawing experience than you. If you keep practicing, you'll be able to draw faster and faster.

I'm enjoying it. It has a companion workbook that sets up a pretty clear learning path which has been useful.