Of course trading is very complicated especially when the trader is a novice that doesn't understand what trading is all about, in most cases people seem to forget the risk associated on trading because they are overwhelmed by the profit they believe they will make if venturing into trading forgetting the risk.
I don't think trading is really that 'very' complicated like you mentioned, what I would say as a novice is, trading needs total submissive attention from you as a trader, particularly when you are still new into the trading platform. However, there are a number of things one will need to learn before jumping into trading. In as much as one is able to pass through that initial rigorous process of learning the intricacies of trading, it becomes more simplified.
Most novice and inexperienced traders prefer to always look for the shortest way into trading thereby creating room for missing gaps of knowledge which only makes them poor traders. Saying that trading is complicated may not be far from the truth, but for traders with interest who are ready to pass through the basic journey to becoming successful traders, it becomes simplified.
For an investor to have rest of mind is to avoid trading because in as much as trading may look so interesting in times of profits returns that's how the chances of losing is also there so the best is just to stick on investing on Bitcoin and hold instead of chasing Bitcoin price movement.
Exactly, and I can say that this also correlates more with your above paragraph which advices us to reduce our over ambitious character towards trading. As an investor new in the system, you can still attempt the DCA approach and use it to develop your experience with investing, the more. But always have a balanced judgment on the volatile nature of Bitcoin and make proper research before investing.