Sound, yet often ignored advice from Patrick Rhone:
I’m a writer. I have everything I need, right now, to write. Take away my computer? I’ll still write. I’ll use pen and paper. Take away my pen and paper, and I’ll use my fingernail to scrawl it into the soft bark of the nearest tree.
Extreme? Perhaps. But I can tell you for certain that, when it is time to write, nothing will stop me from doing so.