I was in the same boat 10 years ago. This is what I’ve learnt, it might help…it might not.

Get your learn on about your disability. Understand what it makes difficult for you, so you can strategise around specific things. This is metacognition (thinking about thinking). I had some one-to-one training/tutoring on this at work which was so helpful. You take a task and break it down into steps, figure out which ones are hard for you. Then you figure out why—what about it is hard—and find ways to make it less hard. When you know specifically what’s hard (spelling, or organising ideas) you can go looking for things that can really help, and it won’t always be things designed for disabilities. Sometimes it’s a change to how you work, or getting a person to support you. Sometimes it’s technology. Sometimes it’s a little of everything. It won’t always work first time, you need to play around until you find the way that works for you.

Most disabilities aren’t black-and-white. Don’t feel like you’re “doing it wrong” if your interests or talents are outside the cultural narrative of your disability. There’s a ton of ignorance and over-simplification when it comes to things like dyslexia (like, it’s just a “reading” disability, or it’s only about spelling…). Worry less about the label and find the tools that work for you. You don’t have to be a superhero and do everything, either. Play to your strengths and delegate the rest if you need to.

Find positive role models. Don’t let yourself feel like you can’t be a writer, or can’t be a real writer. You’re not alone. Seeing your experience in other people is the most encouraging thing, I’ve found. I particularly like Philip Schultz book My Dyslexia because he does such a good job capturing the outsider experience. And Rick Lavoie’s FAT City workshop…seeing otherwise-competent adults struggling like I do was the most empowering thing :-)

Writing is hard. Most of the hard is over and above your disability, so don’t beat yourself up ;-)

Here are some things you might find useful:

LiveScribe—this is a pen that records audio, but with magic. When you point the pen at something you wrote/drew, it cues up the audio that was recorded at that time. The power in this is you can create a visual map through the audio content by making very brief notes (and they don’t have to be words, you can draw pictures). Great for people who struggle to listen and write at the same time. It’s meant for note-taking, but I think you can use it to sketch out your story and capture your ideas by talking…and then organise it later. You’ll be able to find the ideas visually within the audio instead of getting lost in the text/listening.

Scrivener—this is an absolute god-send for anyone trying to organise a complicated document. It’s not a disability product so it’s cheap as chips, but it’s just so good at supporting working memory and organisation. The magic of it is allowing you to work on the same content with index cards, outline, and the words—all in parallel and interchangeably. So you can always see where you are, you can throw all the words down and then cut it up and re-arrange it later. And you can work with icons and colours and tags to help you visually. It is a little overwhelming at first, but the tutorials are really good. I spent the first 3 months using it like Word while I got the hang of how I could use it to help. It works really well with a screen-reader and dictation, too.

Text-to-speech—if you have a Mac or iPad Siri is magic. You can set it up to read selected text or everything (so blind people can use a touch-screen), or something in between. I use VoiceOver to read content to me: e-mails, webpages, documents, Kindle books… there are plenty of screen-readers to choose from. Word has a built-in reader under Learning Tools. Buying an iPhone to read Kindle books to me was the single best thing I ever did, suddenly I had access to all the books I’d never been able to read (not everything is available as an audio book)…which is a lot of how-to-write education.

Speech-to-text—Dragon is the thing that lets you talk and it turn that into words on the page. It’s built in to Apple products, a separate bit of software for Windows. You speak, it writes. If spelling or typing are really hard, this can be a god-send, and it does work really really well…but it’s not perfect. It works best when you speak in sentences, it’s pretty terrible at single-words. I find the lag between speaking and the words appearing is…difficult. Enough I can’t maintain my train of thought. And you have to watch for when it mishears you (so many things sound the same to a computer but a person knows one is clearly wrong from context). If spelling/typing is an obstacle it’s likely much more useful to you, if finding the word you want is hard, it's probably not.

The Snowflake Method—Think of it like a satnav for your story. Once you’ve got the destination and route selected, you can concentrate on driving and let the satnav tell you when to turn so you don’t get lost. The key is how it's all a fractal: the tools you use to plan the whole story are the same tools to plan an act, scene, chapter, paragraph, or sentence. You just keep going down into the detail until the thing is written.

A visual guide to writing—this is a really good guide to getting your point across. You can apply the same ideas to non-fiction too.

June Casagrande’s books—if you have trouble at the style, grammar, and punctuation levels, these books are just marvellous.

Where to find support—this is the place to go in the UK to find specialist tutors who support/tutor adults with specific learning disabilities.

Hope this helps?