The poem is never complete in the mind. It emerges, and then it's like an act of unveiling. The unveiling is the longest and most difficult part of it.
If you are working in an office, where do you find the time to write a novel? But you can finish a short story in five pages. Furthermore, a short story is a perfect place to learn the craft.
I began my writing life as a poet, so poetry has always been fundamental. I evolved from poetry to journalism to stories to novels. But poetry was always there.