I am happy to report that I am making good progress on my book.  The mind mapping exercise proved effective and I managed to get clarity on the structure.  The book is now organised into clear chapters.  It has a clear structure and I am now working through each chapter.  I aim to spend 30 minutes per day on the book.  I do that most days.  Not a huge time commitment but it does add up and 3 months on from my last post I have made good progress.  I still find the process of writing boring.  The exciting part is seeing the book come together.