Scenes form in my head line by line by line, very easily, not too much of an issue at all. I'll be staring at something and automatically find myself "writing" about it in full sentence form in my head, down to the tiniest florishes. Everything I look at I seem to automatically do this to...It's a very weird, sometimes unsettling, but interesting phenomenon in my brain. Most of my editing that I've done has been for for continuity/plot issues than actual line editing...

Sorry I can't be of any help!