My writing process goes more or less like this...
1) Am in the middle of boring non-writing task, e.g. washing, squashed under someone's armpit on the Tube, eyes glazed over staring at Excel at work, when lightning bolt hits brain. An Idea has arrived. And now I MUST WRITE THIS NOVEL IMMEDIATELY, THAT'S IMMEDIATELY, ABANDON EVERYTHING AND LET'S GO!
2) Two thousand words in. Wow. Fingers raw from typing, maniacal grin plastered to face. It's 2am but that's fine. This is GREAT. Imagining bookstores lined with my novel, signing copies for adoring fans. Being interviewed at premier of film adaptation. Phone ringing off the hook. What's that, Harry Styles? You're begging for the lead role?
3) Ten thousand words in. Wireframe plot of nonsensical lines of dialogue and thoughts beginning to crumble. Self doubt sets in. Perhaps...this novel is not the one... No, no. Don't be weak. Persevere. You've got Harry Styles' future acting career on the line here!
4) Twenty thousand words. Am by now a mess of rewriting and anxiety. Imagining crawling to the end of this novel only for it to be submitted to agents and laughed at as the most droolingly pathetic excuse for novel-writing they have seen in their sophisticated lifetimes. Have sweaty nightmares of rejections with simply the words HA HA! scrawled in red pen, a la the Nelson Muntz Literary Agency. Spend hours rewriting one paragraph. It's 2am, but everything is Not Fine. Not Fine at all.
5) Draw diagrams of plot movements to calm brain. Realise nothing actually makes sense. How does one write bad guys? Would anyone ever, truly, be so maniacal? Research serial killers and find that, disappointingly, many real bad guys are just pathetic, not even in a Love-to-Hate them way.
6) As writing exercise, consider re-writing the Harry Potter novels from Voldemort's point of view. That will teach me how to make a sympathetic villain!
7) Wait. Where can I find an accurate source about Voldemort's family tree?
8) Three hours into a wikipedia spiral about silk moths, when disaster strikes. No, it's not a silk moth, it's a silk worm! Three sequel's worth of content shelved. Panic well and truly setting in. Twitching in sleep. The words HA HA! swirl around my brain. Voldemort re-write not even a worthy distraction. Everything is exceedingly Not At All Fine.
9) Lay awake at night and suddenly, BINGO, lightning hits again. We can make this work, brain! Just...get rid of those nasty, fetid thirty thousand words you've already done. Look. Nice fresh, clean page. This time...this time it will be The One...