The first band is easy as there are no other wrapped band thus nothing to worry about. The second band will cross the first band twice. You cant just arbitrarily go over or under because when you wrap the other bands, you can get the ordering all out of wack. What I do is take a few pins - white and black and where it will "cross" a band I will put a white pin for go over and a black for go under; then when I am done I really only have to pay attention to the pins that are at an actual wound band and afterwards, I remove all the pins and move to the next band, determine what pin to place and then winding it making sure the over's and under's are correct.
Trust me, you make the same mistake 3 times, you learn!
Next up is another bonus temari and a pattern.