Sometimes reading books won't really help your to understand anything about trading. Even watching videos might not help you a lot cause that person doing the video wouldn't explain it so much in a way that you're going to understand it. But if you're there face to face with someone who has learnt and mastered everything about trading, he or she will be able to teach you better in a way that you're going to understand it. And if you can also work with them, it will get better perfect in it. But no trader is 100% perfect, cause that risk will always be there. But being an expert means that you will be able to minimize the risk you take and make more profits than loss.
You are right, one is more connected mentality and physical when someone is directly there to guard such trader, but you still have to make sure that you get a friendly successful trader as mentor. We have some traders that are destiny killer, your approach to them would be the beginning of your downfall because they dont want people to be as perfect as them, and we have lots of them in my country.
I remember when I first knew about trading, I approached a friend who has been a friend to show me the way, at first he charged me heavily which I didnt object, and then he tried to discourage me that trading is only for those that can do math, which he knew I was bad with math, but God had is way, I am a fast learner, so I learnt the basic things through YouTube and then enrolled in a physical training center, it was at that point I really got to know a lot meeting my tutor in person.