Comedy writing: Keeping going

All comedy writers dream of hitting upon an idea that simply "writes itself". Sadly, such projects rarely exist; even ideas that seem to shimmer into being fully formed start throwing up problems and difficulties once you start committing them to the page. It's quite common to find yourself blazing through the first few scenes of a draft, or the opening third of a storyline, then suddenly run into challenges.

Of course, this is often frustrating - but it's also perfectly normal. Writing professionally is as much a test of endurance as it is of skill (though building your skill-set is...