I recently interviewed my wife, a specialized interior designer, for my podcast: http://consultingpipelinepodcast.com/116
The first interview with Cheryl, back in episode 8, was one of the most commented-upon episodes of this program. That's where she talked a lot about the fear that often accompanies the decision to specialize.
She's well past that fear now, and we spent most of this recent conversation talking about what she's learned about lead generation and services packaging.
I think you'll enjoy this conversation: http://consultingpipelinepodcast.com/116