Leigh Alexander has some advice:
Everything becomes easier when you’re drinking. Writing is a process during which production is organic and intellect needs to be assumed or taken for granted. You cannot write if you’re thinking too much, or if you falsely believe there are some kinds of ‘decisions’ to be made regarding your topic or angle of approach. If you drink you stop thinking and your hands drum the keys with the faultless, rapid cadence of the sort of clear, light-starved spiders that live in the least-lit crevices of the world. Your brain glides with the surety of the oceanic trenches’ blind eels.
Worked for Hemingway.