From the manufacturer information it is clarified that the above valve clearance should be checked in accordance with the set interval only if the valve train is noisy. Start you work by removing the cable in question from the negative terminal of the battery. Secondly, pop the valve cover (s) off from the engine block. Toyota, for example, is explicit that the rest of installation of the assembly in manually transaxled vehicles is the reversal of the removal. Last but not the least, join the battery connections back and proceed with the other relearn steps that may be required.