Once the sugar is dissolved, I pour it back into my measuring cup and put in the refrigerator to cool. (The nectar looks yellow because it's sitting in front of pineapple. As a note, I read that it isn't necessary to dye the nectar as long as your feeder is red (plus food coloring isn't good for the birds).
While the nectar is cooling, I wash the feeder. Once it's a good temperature (not too cold), into the feeder it goes. Hanging the feeder outside is the risky part. I always look around to make sure no militant birds are lying in wait and slip it over the hook as fast as I can!
Earlier in the season, we had at 3 or 4 adult birds who were constantly feeding. We figured they must have been feeding babies too. I was refilling the feeder every two-three days, but now I'm down to once a week.