dowelling and stacking a cake

I was watching a video at the weekend on the web about how to dowel and stack a cake. It was clearly made by someone who does not do this  for a living, and there were a number of errors in the process, such that the cake was contaminated with unsterilised dowels, unsteady and uneven due to inadequacies in the process demonstrated.

I would advise anyone doing this themselves to either read a good cake decorating book, which should have appropriate instructions (preferably UK written, by a BSG member,  so our health and safety requirements have been taken into account), or consult an expert.

So do use the web, but consider  how informed or reliable some of the advice given is.