Been away a few days so just got to this. A friend of mine has been doing her Masters in Professional Writing here in Cornwall. The novel was only one part of the whole - but she learned a lot about article writing and other facets of writing.
Yes, I guess it all comes down to perseverance in one form or another and the rocky path to publication (or not) certainly would sort out the sheep from the goats.
(It would be pretty baaaaaad to discover one is a sheep.)
Susiex