It is a lot to take in. really is. But they are right. Once you get into the manual, most of it is there. Some things are inferred, or briefly mentioned (written for a pro) and can be confusing to the novice. When you have a problem, take a break, step away, take a breath, then come back and try to look at the bigger picture. Check all wiring and do some continuity and other tests to check off items that could be problem (like bad wiring, device, etc...)