I don't mind faffing about with language, I'm OK at seeing the silly mistakes where you don't know who's talking etc. (I also know I'm terrible at seeing repetitions, but I do hear them when I read them out to no.1 son!) My problem is the big stuff, who knows what when, which order is everything in? Are characters consistent? I'm worried that chapter 1 will end up overwritten and the later chapters won't be written enough, so I'm just going to edit in order while I keep writing the main book.