I share the same experience. I had one day an epiphany and I wanted to make a movie about it, it was about beauty. Everyone said I was completely crazy (probably I was/am) but I got every penny I had and went on to film my documentary. I had no crew, and did it all by myself. I have travelled to 11 countries and have interviewed about 30 people.
I went on this ‘quest for beauty’ which is also the name of my doc, now in post production.
So yes, believe in yourself and in your idea and make it happen.
Thanks for your encoraging words.