I worked in radio briefly during college. Learned to do basic stuff like "normalizing" the audio, splicing, level adjustments and stuff like that. It's amazing how many "professional" podcasts don't do that stuff. The normalizing is important as it prevents large differences in volume between different inputs. We used a program called "cool edit pro" and it would take about 5 minutes to do all that for a 30 minute segment, at most.