I'm trying to, although I'm finding it hard to balance writing-for-money with writing-for-fun. I also have a full time outside job, which further complicates things. I'd like to eventually earn all my money through freelancing or novel-writin', but I'm not there yet.
What works best for me is to work on my novel FIRST, to say to myself, "Okay, I'm going to write 500 or 1000 words in Tigerlily, and then I'll go on to work stuff." I can almost always plow through work writing even if I'm tired or cranky, but I need a fresh, clear mind for creative/fiction writing.