Kirstin on Fullback and Friends:  As Susan Jeffers would say “Feel the fear and do it anyway”.  Usually when we have been nominated to lead or contribute to a work project, be it challenging, creative or technical, it is usually because we have the skills that will make the project a success.  It is normal to under-estimate your capabilities (we all do it), think about what the project has to offer you, before you say no.

  http://www.themuse.com/advice/what-to-do-when-you-dont-feel-ready-for-a-challenging-project