You can use a pizza paddle for this, but the easiest method is to stretch out your pizza dough onto a sheet of baking paper. Carefully slide the baking paper with the dough onto a flat baking tray to carry it to the pizza stone. Then, slide the pizza (still on the baking paper) onto the stone. You can use the baking paper to help slide the pizza off onto your serving board for cutting, avoiding direct contact with the extremely hot stone.