I've re-wired a few and there are some good tutorials on the internet. This one
http://vssmb.blogspot.com/2012/01/co...ted-motor.html is excellent for gaining an understanding of what you are doing inside the motor and also has great techniques to practice in preparation for doing the work. The motor in this tut is not exactly the same as the motor you are dealing with but similar.
This YouTube shows you a bit more about what the motor you are opening is like inside.
https://www.youtube.com/watch?v=hvYo90gIoiQ