I don't strive to be good enough, but I have learned that accepting my limits when I'm faced with them is best. Jan Hunt, a child developmental psych asks parents to always remember that their children "are always doing the best they can do" with the emotional resources they are working with in the circumstance that they are in. I have learned to apply this to myself, but always keeping in mind that I have the right and responsibility to continue learning and growing. There are some things that in my mind I have made entirely unacceptable, like hitting or punishment, and I give myself no leeway. Other things, I have let go of, like 100% organic food 100% of the time. <-----Total pain in the arse!
I've read through "Magical Parent-Magical Child", but haven't read any of Pearce's recent books. I'm not a huge fan of Byron Katie, but she really helped bring out my inner SP as far as accepting what is.