Doubt manifests in those nagging little, back-of-the-mind thoughts like:
"I can't decide on a niche and don't know where or how to get started ... "
"I'm feeling stuck about how to move ahead ..."
"I feel like I'll never get to a six-figure practice - it's unreachable ..."
"I can't move ahead until everything's perfect ... "
"Someone's already specializing in this niche in my area ... "
"My colleagues all have full schedules; the market's locked up ... "
"I can't decide where to put my energy ... "
"I feel bad charging so much and everyone wants to use insurance anyway ... "