I couldn't do without this book. I started researching my family tree over 2 years ago and found that there were things I didn't understand, information I needed but didn't know how to get and this book points you in all the right directions. It also details what certain occupations were about and their importance and has a few links to the programme - shows how they found out certain information and so on.
All in all, I don't regret buying this book for one moment - it is full of website addresses, addresses to write to and lots of information you thought you knew but realised you didn't.
A great help!!