Ok I'm going to bite.
You stated in order to do the job you have to turn the gas off correct?
Well when you turn in back on it is mandatory to do a test for tightness on the installation every time. This is for a reason.
There are many old appliances still in houses that do not have flame failure devices and therefore by turning the gas off and then on again you MAY have no way that these are now safe. Old gas cookers, basket fires, wall heaters all fall into this category. Are you competent enough to check and relight these appliances? You may know what you have in your own house but I thought I would explain why it's not quite as simple as you are making out.