If your PhD is like mine and stretches over more than one speciality, a word of advice. Make sure you are reading and researching in all the fields equally. My speciality is the technical side and this is where I have been reading to the detriment of the other side. This is now really obvious when I look at the number of papers I have on both sides. I reckon I have at least twice as many documents on the technical side rather than the autism side. I think that the way to go is to try to keep it even, then you won't have a large amount of reading to do in an area that may not be your favourite. I am now trying to balance things up a bit. Not much fun