On a smaller scale, positive and negative thoughts will be simply signposts. The positive ones will be small satisfactions: "oh, that paragraph makes sense now." The negative ones will be small frustrations: "oh, doesn't make sense, not yet!." They won't have tremendous emotional power, because they won't take the form of sweeping statements (I'm brilliant / I'm lousy). You still have to listen to them, because they contain useful information. You want to know if the sentence is good or not, after all. What you really need it the freedom not to be afraid of a sentence that isn't good yet.
The kind of ego that shows up in negative judgments is even worse, in that respect. It is egotistical to think you are bad at something when you haven't earned the right to say you're bad yet. I can't play violin at all, have never picked on up, but I've only earned the right to say I'm bad at it if I've practiced for hours for a few years and then still can't play.