In his novel Hollywood, a not-so-thinly-veiled account of working on the movie Barfly, Charles Bukowski wrote this:
Writing was never work for me. It had been the same for as long as I could remember: turn on the radio to a classical music station, light a cigarette or cigar, open the bottle. The typer did the rest…
Open the bottle, turn on the radio, have a smoke. Or find your own routine. Do what you need to do to let the words flow.
As they say, if you love your work, you never have to work a day in your life.