Some poker players say that it's important not to think of any the money in the pot as your money. If, in draw poker, you put $10 into the pot before the draw, you just have to forget that fact. If you keep thinking of that $10, you'll bet to protect your investment. And you'll make bad decisions.
That's how the writing process works. If you keep thinking of the time and effort you've invested in a piece of writing, you may be unconsciously reluctant to change anything.
This week, after you draft each piece of writing, walk away from it for at least five minutes. When you come back, pretend you're reading it for the first time. That trick will help you get the objectivity to change what you need to change.