I have been fooling around with watches, and took one apart after watching a YouTube video. So many things seemed difficult to figure out until I took this class. DO take this class before you start tinkering. It will save you a lot of trouble and answer many of your questions. This class is very easy to follow and each module is fairly short and easy to understand. Not a single point is missed, everything is stated clearly so you are left with no questions in your mind. So glad I found this class.