Most newbies lose huge amount of money because, after learning the basics of trading they feel they know it all, they think they can manipulate through the market. But they end up losing big.
No matter what you are thought, you must know this that to be a successful trader, it takes practice and consistency.
there are many things to understand and experience is a very valuable lesson, there will be many things in trading that are out of the picture that do not match the reality of what is happening.
Consistency in many ways is very necessary, as you said, not only practice but definite targets and also being able to control yourself not to be greedy in trading, it is very important to be able to minimize mistakes that occur due to not being able to control emotions.