If you aren't making money yet, worry about selling your work first. Save all your receipts for everything, follow your accountant's instructions, pray. I've got to admit I've considered doing this. At one point, I tried working on the side as a Writer's Digest instructor, but it didn't pay enough to give me the safety cushion I'd hoped for and drained a lot of my energy from my regular work. I've considered setting up a class, but haven't done it, mainly because I'm afraid it would turn out like the Writer's Digest thing, and I don't want to pull myself away from my books.
Some writers do it.
So far, I'm not enamored enough of security to put in the work, I guess. This site created, maintained, and attended by Holly Lisle. All rights reserved.