I just finished editing a photo montage. The problem was that due to the image sizes and the format I was using, I spent the entire editing process looking at this:
Sure, there would have been ways to render it out and then edit, but none of them elegant enough for my tastes, so, instead, I edited the piece "blind" and am rendering out a rough cut now.
In about three minutes I'll see how I did.
And then I'll tweak it more tomorrow. Being able to adapt to different conditions is important as a filmmaker... even if that means you can't see things while editing.
Your Media Production Mentor