I have developed an oil leak that the mechanics said is most likely the valve cover gasket which is dripping onto the exhaust and ever so unpleasant and smoky

I have searched and found several people say that this is a pretty easy task. I recently changed the plugs, wires, cap and rotor - although it was one of the most interesting I have ever done. I have not been able to find a description of the process or a source for the steps. The mechanic says it is a 3-4 hour job and mostly labor cost, so I would prefer to do the labor if it is easy enough...Any help would be appreciated.
