This comes from Kai, my wife, who produced the film. She [quotes from] Rio Grande: ‘Get it done, Johnny Reb.’ It’s like, don’t make excuses. There aren’t any anymore. If you’re talking about it, you should be doing it and she doesn’t like to see talent go fallow. She doesn’t like to see people repeat themselves. She likes people to get it done, purely out of love of the person and then joy for the product itself. And that’s the thing: I talked about Much Ado for 10 years and it was Kai who finally said, ‘What if instead of talking about it . . . ’ and I went, ‘What?’ Someone will always tell you that you can’t. One of the things that she delighted in was the fact that, apart from telling the people at Marvel so that they didn’t freak out when they found out that I was directing another movie [while we were in postproduction on The Avengers], we really didn’t tell anybody. It was just our little thing. There’s an old thing they say: Writers never tell somebody what you’re writing because then you won’t write it down, and it’s kind of applied to the production in a way. If we let this get out and balloon into something that mattered to anybody besides us, we might not finish it.
From here. It’s Joss Whedon talking about tips for getting stuff done, which is at the top of my “I should get better at that” list currently.