I'm just now discovering this thread – a great topic to discuss, moredhel!
And so many great contributions from others. We have much in common in the creative process.
The American author Stephen King has said a few things about creating, and one of my favorites is basically that the “Muse” is more of a partner than a fairy godmother. The Muse needs to know where you're going to be, and that you'll be working when he gets there, so that the environment is right for him to open up the “bag of magic”. Perhaps Stephen chose to characterize the Muse as a grouchy man because it reflected his experiences with inspiration!
The people who see great spectacles in the sky have already made the habit of watching the stars. And so they are present for the meteor showers, eclipses, etc. This was a truer statement when we did not have modern weather services, but you get my point! If we can build the discipline to devote a certain amount of time, and a certain amount of attention to our craft every day, then whenever the Muse descends, we'll be ready.
For me the discipline is not always daily, but I've been doing it long enough that in my mind there is no question that
I will make art, good or bad. And
I don't feel ready more often then I do, but I begin anyway, feeling like an unqualified amateur almost every time, even though I've been drawing for decades!
There is strength in looking past your feelings of being an imposter and instead thinking, "If I spend this present moment making art, then I am an art-maker,
in fact," and now it's a matter of historical record! No one can dispute it, not even myself!
And I believe most (if not all) of us are capable of training our minds to do this - it takes time and persistence, but it can be done.