With digital cameras and cell phones, the photo thing is so easy and such a huge thing as far as getting help nowadays.
You can get help and a diagnosis from all over the world with more clarity, especially if you're not mechanically inclined or new to the lingo.
And the big one for me is my lack of memory. I take pictures of everything I do. Both for the immediate purpose of being able to put things back together correctly, but also for future reference when I need to remember if, when, and how I did something.
As for the manuals, I do my best to read them, get online to check, then come here to verify all of that.