or do you sit down to work even when you don't have particularly inspirational ideas and build them as you go? There seems to be this whole thing built up around inspiration and we even have the word "eureka" and everyone knows how the apple dropped on Newton's head or how Paul heard "Yesterday" in his sleep etc. On the other hand, many artists say that they work on a schedule (like you) and that seems to work too. Steven King says he writes 6 pages every day. So either he has an inexhaustible well of inspiration hidden somewhere or he doesn't need inspiration all the time to make progress on his books.
you need both. inspiration is the free energy that makes all this possible, but unfortunately it can be extremely extremely disorganized. so if you listen to only direct inspiration for your immediate agenda, you will find yourself extremely confused at least half the time, on average, despite the fact that inspiration is what any agenda was originally created by