Screw up your own

You shape your voice by screwing up your own ideas. If you screw up someone else's, it's such an easy ride, too easy to blame them.

[...]

New writers tend not to write enough. They spend light-years writing their first big feature, which is admirable for the purist, but you don't get to know your own voice until you've kicked a script to death and made yourself proud of it. This takes time. Good scripts aren't written, they're re-written.

-- Paul Abbot in an interview with the BBC