It's always so hard to self-edit. In fact, it's only been within the last few years that I realized I have been interjecting "just" a kazillion too many times in my writing. When I first came to this realization I was very defensive. After all, I'm telling my stories through the voice of a middle grade person. Maybe he/she uses "just" a kazillion times. So there. I can do that. I am justified!
After a few nights sleep (or lack of sleep), I realized it was not okay. Sometimes, the things we learn through self-editing don't feel too good. But then again isn't the main idea to get published! :-)