It's Positive Discipline by Jane Nelson (this one is particular to the first 3 years). Honestly, Positive Discipline is fabulous - if you start it now, you will be in great shape later on.
I don't want my kid to become a 2 or 3 year old. Is that horrible to say? She already has her moments. I'm really dreading when she gets more stubborn.
It's ok, you still did very well. Don't get upset with yourself.