Good theory, holding on until the end can be successful, but if you have a lot of losses even though you started trading because you want to earn then you will only become frustrated because a lot of money has been spent but no profit has been made.
Beginners must continue to learn to be able to achieve good trading skills, but they must also understand that there are many sacrifices that must be made, both money and time, the more you learn, the more money you lose and the time to spend on learning, but if you aren't capable of the sacrifices that must be made, it is better to invest than trade, which is not easy and is not always suitable for everyone.
It's clear to confirm that most traders come to trading to make a profit, and as you said and I would also say it's not uncommon for them to quit halfway through because they may not be able to cope with the situation that causes them stress due to some or many losses, quite a few of them. Those who survive to the end will be successful but that does not mean they do nothing and just enjoy their success, but the higher the tree, the stronger the wind, maybe you understand this statement. But I will also say, if they have a lot of losses it is not the end of the world, when you stop halfway (fail) with a lot of losses it means it is very silly, you just waste time and money. Remember there is no success without failure, all traders experience the same thing, especially losses, and who can survive? those who have there sincerity, nothing more. That's right, as you said there must be sacrifice first.
Therefore, so for them (beginners) Do not be easily confused with the many benefits that others get and then you do it without any knowledge, all work is at risk, especially the world of trading which has rapid price fluctuations. Prepare yourself mentally, train yourself psychologically so that you can make peace with yourself in any condition and learn more new knowledge or for the mistakes you have made. Remember the process will not betray the results, what you plant and that's what you will reap so keep your spirit consistent.