I conscripted The Boy to take photos (he was easily bought with tiny lumps of raw bread dough-I must be doing something right). So the next step after the first rise is to deflate, or “punch down” in old-timey terms. You don’t so much punch it as flatten and fold it.
Do that a couple of times, roll it back into a smooth ball, put it back in the bowl, cover with plastic wrap, and put it back in the warm place to rise, this time 2 1/2 to 3 times its original size. This could take 1 1/2 to 2 hours. While you wait, watch this adorable video mashup of Julia clips and a clever song created by PBS. (Thanks, @cpkimball (Chris Kimball from America’s Test Kitchen, on Twitter)