I'd say I'm about one step beyond novice, sort of at the very beginning of "apprenticeship." Well, I like to think so, anyway.
Still, I take Teresa's suggestion very seriously. This isn't just because she has experience. It's also because of my own efforts.
I've completed a draft for one novel, several drafts for a second, half a draft for a third, and have some other projects in the works. I've also written four short stories and a novelette - all of which still need work, of course, if I ever wish to see them published. However, none of the shorts really did anything to help me with novel writing, except perhaps marginally.
Three of my so-called short stories are not really short stories. They're actually related to my novel work in one way or another and I just hope I can pass them off as short stories. Let me tell you, that hasn't worked out too well yet.
One of the biggest criticisms I received at Baen's Slush for
Hex Moon was, "This reads like the first chapter of a novel." You can believe there were others, but this was one I really couldn't get around.
The first short I attempted to write extended way beyond my projected 5000 word mark. In fact, it's more than double that length. I just have difficulty containing my ideas this way. Now it turns out that I really enjoyed writing it, although maybe not quite as much as novels, and it did help me to learn a
small lesson about character development. It didn't help me to learn how write better novels, though - or better shorts, for that matter.
Besides, if three out of five are actually parts of longer works, I'm still leaning toward novel writing.
I have heard the same thing over the years, ever since I started writing as a teenager. In fact, half the time the advice was "Publishing short stories makes it easier to get your foot in the door. Publishers can referrence your body of work." People told me authors like Stephen King and Mercedes Lackey got started that way. But, as I think Teresa has pointed out before, why would an editor looking at my novel think I can write a good book just because I can write a short story? The important thing to note is who actually gave me this advice: none of them were
writers.
Oh, some of them had good intentions, but they still did not actually
know. Neither did I at the time and I took them seriously, although I still didn't have the inclination to write a short story for a long time.
So if I have an idea I really want to write that can be expressed in about 10,000 words or less, then I'll write it. If I don't have the inspiration to do so, what's the point?