So, you have to finish your story. That isn't to say it's even remotely easy to do. I'm sure I'm not alone in having dozens of abandoned stories lying around on my hard drive. Some of them are malformed and flimsy and should never see the light of day under any circumstances, but others are just unlucky - perhaps they got interrupted and I never quite found my way back into them, or I lost interest in them for some other reason.
Part of the problem, I think - and this is only my personal experience so I'd be interested to know whether anyone else feels the same - is that the process of getting through a story is something of an emotional rollercoaster. If I was to plot a simplified graph of confidence levels through a first draft, I'd end up with something like this:
Essentially, that's the journey through:
- I've got an idea for a story, might be worth a go
- Yes, you little beauty! This is gonna work.
- Actually, I'm not sure about it now...
- Oh god, what was I thinking? I'm the worst writer in the world.
- Hmm, this might be OK after all...
- Oh yeah, I'm the storymeister - this is straight-up genius!
- Right, that's finished. I think. It's alright, isn't it? At least, it might be after a bit of editing.
That slump in the middle, where you start wondering where it's going, why all your characters sound the same, how you're ever going to wrestle the story back to the ending you had in mind when you started - that's the dangerous bit. That's where other ideas become irresistible, when you have that sudden urge to reorganise your bookshelves, when keeping going with the current story seems like the biggest waste of time imaginable. But the key is to keep that arse of yours firmly on the seat, and press on regardless.
For me, the main thing is to keep the momentum going. Plough on, resisting the urge to go back and tinker with the beginning, and get yourself a completed first draft before you do anything else. Don't worry about how ropey it is, or that your main character starts off as John with brown eyes but has changed to Stephanie with green eyes somewhere along the line. It's all fixable. Just get to the end.
I find that it's helpful to keep in mind that the first draft is only ever that - a first draft. It's the roughing-out, the quick sketch to suss out the proportions and the general shape. Don't aim for perfection - in fact, leaving it as loose and malleable as possible can be very useful indeed. And if you get stuck, skip a bit. Lots of my first drafts have notes like [FIND A WAY TO DEMONSTRATE LENNY'S FEAR OF DOGS PRIOR TO THIS POINT] or [CHECK WHETHER THERE ARE THREE OR FOUR PEOPLE IN THE CAR AT THE BEGINNING]. Anything to stop me getting bogged down, looking back over an incomplete draft and losing confidence in it.
If you're getting bored with what you're writing, for instance if you're having to set the scene for a more dramatic part of the story, it can be useful to simply rough out the basic flow of events with bullet points, and then get on with the exciting parts. When you come back to rewrite the scene, you may find that you don't need half as much detail as you first expected.