Timing belts are very inexpensive. When I changed my timing belt, I also changed the water pump as well. I also bought my parts from Honda and the total for both the pump and belt was $85. Give or take $10.00, I can't remember exactly.

As for doing it yourself. If you have power tools and can give a day's work on it then go for it. If not just take it somewhere to get done. Except I would still get the parts yourself and just pay for labor. :thumbup: