My plans for parenthood were to have no plans, and I stuck to those plans! And it's all been fantastic. I'd never looked after anyone else's children before having my own, but I just knew what to do. It was just something I knew I was going to be good at, and I was right. Smug, smug, smug!
I think that having too many plans is a bad idea - all it really takes is the ability to enjoy your child, to be chilled out, and to not let the little things get you down - all things that you can train yourself to do. Positive mental attitude - it's easy if you have that. That doesn't mean there aren't bad days - but you have to make yourself let them go, not hold on to negative feelings and emotions, and just ALLOW yourself to be happy. Children really add something very special to your life - opportunity wasted if you spend their childhood shouting and being too demanding of them, expecting too much of them. Use them as inspiration, and follow their lead - they have a lot to teach you.