To determine the right water temperature for activating yeast, hold your fingers under warm running water. If you feel no temperature, the water is about body temperature, 98 degrees F. Turn the hot water up slightly, just until it just begins to feel warm; this will be approximately 110 degrees F, perfect for activating yeast! When measuring flour, loosen the flour with a measuring cup before lightly scooping it into the cup. Level the flour with the back of a butter knife, sweeping the excess from the cup.