Don't underestimate the importance of having enough room to work. Grilling is much more relaxing when you are not trying to juggle a whole collection of plates and bowls as you do it. If your grill doesn't have enough workspace - and they almost never do - set up a table right next to your grill.
The main benefit of the book for the more experienced practitioners is as an evangelical tool. The book will give you some ways of expressing the value and importance of your work that you may not have had before.
There is only you and your camera. The limitations in your photography are in yourself, for what we see is what we are.