well you are already way ahead of the game. coming here before you got your first ball python shows you will really care for your animal. so for that i applaud you.
as for temperament of ball pythons, at least in my experience, is like any other pet. you get some that are calm and some that are nervous. if you have the chance i would ask to hold the snake before you buy it. it will make you a lot more comfortable knowing what to expect.
this forum is great by the way. ask as many questions as you need to. the people here love thier animals. you will only get honest answers that will help you and your snake to stay happy and healthy. oh, and share your experiences with us too!
good luck!