One thing a lyricist must learn is not to fall in love with his own lines. Once you learn that, you can walk away from the lyric and look at it with a reasonable degree of objectivity.
“Being an actor means asking people to look at you. I guess I accept that. But it's a profession in which the job is to show another world and other people. You may access it through bits of yourself, and your imagination and experience, but actually, in the end, you're not playing yourself.”