I was wondering when should one start sending Press Releases? I'm still editing my video for my documentary so I'm not ready yet. It feels like sending a PR during the campaign is too late, but I don't want to do it too early either
Ideally, I would send one before during and after (if you are successful). You could also do a blog article and then use the press release to link back to that so that journalists can follow your story over time. I would also try to begin developing a relationship with key journalists now, or at least trying to get some kind of email response. It doesn't have to be about your project. It could be about an article they wrote that you like.
The timing of when to send out a PR also depends on your angle for the story. If your story angle is that you are taking off on Kickstarter, then you would likely need to wait until the end of the first week.