The biggest obstacle to professional writing is the necessity for changing a typewriter ribbon.
I have tried to know absolutely nothing about a great many things, and I have succeeded fairly well.
It took me fifteen years to discover I had no talent for writing, but I couldn't give it up, because by that time I was too famous.
Change this and that and try again. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Cras mattis consectetur purus sit amet fermentum.