Indeed, you can learn on your own, but if you have a mentor, why not study with experts?
i think it will shorten our study time but it depends on each person,
trading or investing is certainly risky so it is very important to have knowledge and we can get that by learning.
When starting trading in a new state, we had to start trading by accepting that investment is risky. However, those who start trading without knowledge about trading have to face many problems. And those who have problems can gain good knowledge about trading. So those who Newbies should start trading with trading advice from experienced people.