I think this is my 6th "Dummies" book and I am definitely a fan. Any time I need to learn about something in depth, whether it be a hobby or something I'm pursuing, even medical issues, I look for one of these books on the subject.
My husband and I are planning a 3 week trip to Italy later this year visiting Rome,Venice,Florence and Naples,and are doing all of the planning ourselves. By checking out the recommendations, websites, etc. in this book we feel very comfortable with our arrangements and plans. Another suggestion I would suggest in addition to the book and websites is to go on to Google Maps and pull up some of the addresses where you will be staying and visiting. Most streets have a "street view" and you can pan 360 degrees as well as progress down the streets to see exactly what to expect at each location. I was able to discover things about hotels we had selected that I would not have otherwise known.
Now after all the planning, my biggest challenge is to learn enough of the language to be able to get by.