you will need to at least have:
timing belt
balancer belt
water pump
honda bond or the grey formula of the gasket sealer stuff
then you can replace the tensioner pulleys part numbers-10 and 18 in the diagram. there are also some seal people replace too, I didn't however since I know that my H23 will be rebuilt in the next year or two so I didn't worry about it.
Make sure that you have the crank pulley hold tool and either a high quality impact wrench or 1/2" 19mm socket, 1/2" impact grade extentions totalling 18" and a quality 1/2" breaker bar with a 4' or 5' breaker extention.
that bolt doestn' mess around
and you will need another set of hands helping you make sure the belt is aligned correctly and such. the helms is important to have also