I had an "I could do that!" Moment once, and it honestly changed the direction of my life.
I had dropped out of college for the second time, was profoundly depressed, and not sure what I was going to do with my life. My mom took me to an exhibition of the Denver Botanical Gardens' Botanical Illustration program.
It was a color-pencil-on-acrylic drawing of a Witches Broom plant, and I remember suddenly realizing that wait. I know how to do that. I know how to make those marks, how to layer those colors. I could do this.
I could make something good enough to hang in a gallery.
-And that changed things for me. Yeah, actually, I wasn't a total failure, I COULD do that and in fact I think I will. I signed up for the program, got my accreditation as a scientific illustrator, and my fucking dignity back. I even got to take classes from the woman who drew that Witches Broom.
All this is to say: Actually, go in to galleries and see if there is something you think you could do.
You might find out that the threshold to getting your work shown/published is entirely within your skill level, or (like me) it's something you will get to learn so much more about, or you will wander into a completely different art form but literally whatever happens your life will be richer for it.
Imagine how kickass if the lady in the original post decided to do what Klein actually said did, and we all got a brand new pigment and painting technique out of it. You think you can do that? Good! Go do it! It'll kick ass!!
Like yeah, we all know that there's a lot of people who are all talk, but I am here to encourage you all who ever looked at something and thought '...I actually think I can do this?' to GO FUCKING DO IT IT WILL BE SO FUCKING COOL!!!