I too am about to do this and ANY advice would be appreciated. I am sure half of writing it is about confidence i.e. Personally I feel everything I know is basic and everyone will know more on my subject than me, therefore I am worried I will write something too fundamental and get

I agree with everything everyone has said, in summary we all feel stupid at the beginning. Those who don't may be arrogant as nobody knows everything at the end let alone at the beginning! Stick with it, as time goes by you will understand more and will feel less out of your depth. I am about 10 months in and the second I feel I am beginning to understand my topic area another little thing pops up. The key is to not think about what you don't know but fit these things into things you do know. For example if they say something you didn't realise try and link it to what you do know, you will know something! Over time your confidence will grow. If people knew everything what would be the point of research? We all feel :-S at times but keep looking forward to how happy you will be in 3/4 years time when you can call yourself Dr. (even then you will probably have found more questions than answers and wonder if you learn't anything!)