im changing my timing belt and water pump but what else do i need to make the change and i also went to pep boys and ask for the ac belt and alt. belt i have no powerster. so and i read the belt number on the car and it's different number from what i got today ? need help d16y7 is the engine

 

you need to get a helms so you dont hurt yourself changing a timing belt.

its a very serious thing to do.