To become a real trader, you need a lot of time to understand the market psychology because every transaction you have to consider carefully because just a little mistake. Your property can be reduced by 20% immediately
That is bullshit.
Surely you can trade in the way that you describe; however, on the other hand, you can create a system and follow the system and tweak the system to ensure that it is profitable.
One of the best systems is to buy as the price goes down and to sell as the price goes up. The trick is to figure out your increments in order to be profitable and not to gamble with your strategy and if you do gamble to only use a small amount of your total proceeds for gambling plays.
Edit: My criticism of your post relates to your seeming suggestion that there is a kind of "real trader," and implications that trading strategies are limited.
On the other hand, I do agree with any point that you make that if you don't know what you are doing, and if you get too greedy, gamble too much or bet in only one direction, then you can lose a lot of your stash in a short period of time, especially if you engage in leverage trading (aka margin trading).
Further, like pearlmen says above, a decent strategy for anyone who does not know is to practice and to learn with relatively small amounts of money. Of course the more bullish you are about bitcoin, then the more you will engage in a BTC accumulation strategy, and the less bullish you are about it, then you will try to use it to accumulate more cash - and either strategy can work - and so sometimes going through the trading process will cause you to tweak a bit here or there because your bearish/bullish sentiments change with the passage of time, market momentum and events (news).
Finally, a point that I am attempting to make, here, is that if you set up your strategy to extract value in either price direction, then you don't even have to be correct about predicting the market or even attempt to engage in any kind of meaningful prediction of the BTC price direction - even though you might set your trading strategy up in such a way that you are more profitable from one BTC price direction (the one you are predicting) as compared with the opposite BTC price direction (the direction that you are predicting not to happen).