I am taking it slow, reading the instructions for a change. They recommend a trial run without any jars, just to get used to how pressure canning works. Taking the canner up to pressure and then releasing it went fine but I was shocked to see that the inside of the pan, where it was in contact with water, was black after that first run. The instructions say that there will be discoloration but I was not expecting a ring of black in the bottom of the pan! Having looked online, it appears that aluminium pans do go black when heated and it's nothing to be worried about. Of course, if the internet is wrong and someone thinks this is an issue please tell me.
Apart from that I am happy with progress and even happier that I selected a model that is compatible with my induction hob. It makes regulation of temperature and pressure so much easier.