Overhauling the cylinder-head/valves/camshaft cam-chain assembly is quite straight forward, especially if new components are used to replace the old worn or damaged items.
The items that are likely to be over looked are the wear prone valve-guides. Play with valve stem as it slides up and down the valve guide will not only make the engine noisier (in an unpleasant way) it may also allow smoking from the exhaust, particularly on start up.
Other related components you may wish to consider when overhauling the cylinder-head:
Add as many new parts to the same shopping cart as you wish, new valve stem oil seals 12209GB4682 retainers 14771GB4680 cotters 14781MA6000 & cam-chain spring 14541GB4681 for example, and still only pay the same single fixed price shipping cost.
Please be aware that this component may have other applications within the Honda model range, so check the part-numbers you order are correct for your model and application.
Pro workshop gasket sealant 08CRAHLG120G - easy to apply with professional results.