I'm not a kinder teacher yet- I'm still in training. I have my child care diploma and have worked in child care & preschools but now I'm a SAHM and doing my degree by correspondence. A couple of pros and cons vs primary school teaching for me are:
Pro- More flexible curriculum/play based learning. I much prefer the teaching style in early childhood and I don't want to work in schools because of this.
Con- the pay is less. People keep telling me that kinder teachers are getting the same as school teachers but apparently it's still phasing in... I'll be glad when it happens.

How much study would you need to do? I imagine it's not too much- equivalent to one year full time?