Use a ladle to begin adding broth, 1/2 cup or so at a time, stirring after each addition. When the broth is just about evaporated, add more. The mixture should be neither soupy nor dry. Keep the heat at medium to medium-high and stir frequently. It should take about 20 minutes to add all of the broth. The rice should be tender but still with a tiny bit of crunch. With 3 minutes of cooking remaining, add the shrimp to the skillet and cook until they turn pink.