I can wholeheartedly agree with what Anne says about the creative process. And it took doing NaNo to bring that home for me. I don't edit while I'm writing any more, because it does interrupt the flow.

Editing your own stuff is hard, but there are a couple of tricks I've learned along the way. The first one is time consuming, but read your work backwards, one word at a time. When you're reading front to back, you see what you expect to be there, whether it is or not. This method is great for spelling. Another trick is to read out loud, pause at every comma and see if it interrupts the flow of the work; if it does, then take it out. Reading out loud also lets you see how the work flows and will highlight awkward or choppy sentences.

I hope these tips will help, jabber.