Buy a Snap-On or BluePoint 10mm (for B18C1) valve adj tool and youll never have to worry about it again.

Be careful taking the VC off and the gasket should be fine, depending on its condition. You usually wont have to replace it, but scope it out for tears when you take the VC off. Also make sure you put it back on correctly, with dabs of that red grease (the name escapes me right now, maybe hondatech can chime in) only on the flat spots of the gasket.

Adjustments are cake after you give it a couple shots. Definitely worth the price of the tool to be able to do it yourself.