I'm currently applying for DLA (but for more than just dyspraxia). I believe that my Dyspraxia alone entitles me to LRC and LRM. With the Fibro et al I believe I should get MRC and HRM if I am very lucky.
Firstly DO NOT fill the forms in by yourself, get help from CAB, DIAL or Welfare Rights - people who apply via them have a much higher initial success rate and a higher success rate at appeals and tribunals.
Secondly - almost everyone is turned down by default the first time they apply. Appeal, appeal, appeal. Up to 40% of people are awarded at appeal.
Thirdly you have to put down plenty of detail, thoroughly explain HOW your condition affects you day to day, why you can't do X and what help you get/need for it. In theory Dyspraxia could entitle you to LRC if you cannot cook a meal from scratch by yourself (microwave meals don't count). It could also entitle you to LRM if you need someone to take you to unfamiliar places because you can't follow directions, read a map, tell left from right, need help crossing roads etc. The language used is important say things like 'I need' 'it is essential that I have help with this' etc.
Fourthly - get your GP/Neurologist/any other medical professionals you see on board first. Make sure they will write you a good supporting letter. If you do get refused ask to see the medical letters (DWP have to give you this info). This is a massive hurdle for many, often the DWP write to the wrong GP at your practice who may not know you well, or even know you at all. Or your GP may not realise how bad you struggle - after all Dyspraxia is so encompassing, we simply can't mention everything in a 10 min appointment.
Here's how I have done my application;
1) Highly detailed form, inc 7 sheets of extra info for the questions. I filled the form in by PDF which makes life much easier - HOWEVER I would still advise you to ring and request the paper form. This will be date stamped with two dates, mine said requested on 25 November 2011 and said if I returned it by 6 Jan 2012 any money awarded would be backdated to 25 November. It's worth doing that just for the backdating. If you got LRC and LRM that's just under £40 a week, backdated by 7 weeks is maths I can't do
but calculator tells me is £280. Handy to have
2) 6,700 extra words (think 11 typed sheets of A4) explaining what each condition is and how it affects. About 3 pages (2000) words are on Dyspraxia. I copied a lot of info from my ESA 50 form so it all matched up and was in similar words, if you are claiming ESA then your ESA 50 is a good starting point
3) 2 articles (each condition) explaining all 4 conditions I'm applying for. For Dyspraxia I printed off the NHS Choices page on it for adults and the Dyspraxia Foundations Symptoms Checklist. I highlighted each one which applied to me (all but about 3).
4) Medical letters, I sent each diagnosis letter and a report my Neuropsychologist sent to my GP stating all the problems she found I had after a Neuropsychological assessment in 2010. I also gave the details of my GP, my two Rheumatologists, my Counsellor and my Hand, Physio and Hydro Therapists. They need details of all medical professionals you've seen in past 12 months. Get anyone like a Physio etc to confirm your problems.
5) I got my parents to write me a supporting letter as they care for me daily
6) And Finally I saw a lovely advisor at the CAB. I initially filled in a short tick box form of my areas of difficulty, about 3 weeks later they rang me and advised me it was worth me applying and made an appointment. She helped me immensely and explained to me how to word the form, what info to put down, what to emphasise etc.
Good luck