A mate and I used to fish the rocks from Cape Solander to the stink pipe for blackfish after school. We made our own cleats in metal work class and bolted them onto the soles of pair of sandshoes. We were taught by the old fisherman who were pretty strict, they had a couple of rules you had to follow like know the tides, watch the waves (look out for the 7th wave), always wear cleats, have a rock "hold" for emergencies (this was usually a rope tied around a rock outcrop or through a eye bolt put into the cliff face) and never fish alone. They would kick you off the rocks if they ever saw you not following the rules.
I would never let my kids do it nowadays and there is no way I would tell someone else kid to do it. My advise, if you really want to do it, is find a mentor to teach you over time, in lots of different seas and weather and never think you know it all.
J