First the DMD is a Harmonic Balancer.
Second get the Haynes Manual for the car it will help alot.
What you do need to get is a Harmonic Balancer Puller which can be rented. Talk to a place like PepBoys or Advance Auto.
The Waterpump is always a good idea. If you did it every 25K it would still be a good idea, since the death of an engine will cost far more.
