It's a very delicate venture investing in cryptocurrency. It's something one should be careful about and make a dedicated effort to research well before going into it. Most people just hear of successes made by others in crypto and because of that, they feel its an easy stuff and just dive into it.
One thing I can say is that cryptocurrency is a business for the strong in heart and determined. Also, patience, much of it is required when treading the part of cryptocurrency. Its best to start small, at least with established projects, Bitcoin and Ethereum before moving to upcoming projects like Veil, Harmony, etc.
Like I earlier said, research is of uttermost importance when choosing to invest in cryptocurrency.
The "success" word is quite misinterpreted by some people, or some even interpret it in an exaggerated way. Just like what you had said that, they feel that it is now an easy thing to do when someone has the history of its success. The problem is that they follow purely the methods/mindset of how that successful trader did their best in trading. While it could probably work in a day or two, they need to always keep in mind that it will not always apply to different trends plus different times especially that it is an obvious unstable market.