This book is primarily based on UK patenting, although the writers may be US experienced. There are also extracts and experiences from Trevor baylis; the chap who invented the "wind up radio" in the eighties, thats his photo on the front. There are allot of similarities to the Uk & US systems, equally there are allot of differences. The essence of the book is to guide you through the process or at least give you a more clear understanding of how it's done and to some degree you could actually file a simple patent with the guidance in this book. However the book constantly emphasises that you get a professional to write up your patent, which I would totally agree with, particularly if you are not proficient in technical writing, or appreciate the different ways and angles you would need to cover your patent to a good level of protection.
All that said, and if you do feel that you can take up the challenge of drafting a patent yourself, I feel that this book is a good overview and you it would be necessary to supplement this book with something more in depth to give you a more comprehensive overview and take you to the next level of attempting to patent yourself.
For this purpose you will need "Patent it Yourself" by pressman, who was a patent attorney and an examiner at the US patent office. His book is simple enough and well written, for a pretty technical subject. You could dive straight in to "Patent it yourself" but I wouldn't recommend it for a novice. Start with the Guidance notes from the " intellectual Property Office" , then use the Dummies guide and if your still feeling courageous, then order "Patent it yourself". This book will not be entirely relevant to the Uk system, those bits can be ignored, but they can give you a insight into requirements, should you need to get a patent in the USA.
The most relevant chapters, are how to actually draft a patent and get you thinking about all the little technicaly niggley bits . The angles you need to look at and how you actually write up the various elements of the patent. Bare in mind, some of the elements required in a patent may be the same as the UK, but you have to actually write your patent up to the UK criteria and there are some minor differences. Whilst Dummies guide keeps refering to getting it done by professionals, Pressman is the opposite. He keeps saying that you can do it yourself, which is quite inspiring.