I think we all know that the crypto market is famous for its volatility. No one can predict with certainty when prices will fall or rise. Therefore, buying early can provide an advantage if prices increase in the future.
And that is why it is called as predicting because there is no guarantees. Given that one can only predict, I won't be confident about buying early. I know some coins like BTC are already proven but I'm not referring to them, rather I'm only referring on our topic here.
Investors who already have experience are usually better able to manage their emotions when facing price changes. They are not influenced by fear or panic to sell their assets, on the contrary, they will never delay in accumulating or adding as many assets as they can.
That sounds like they are perfect anymore but I still believe on the saying that nothing is perfect in this world, therefore there would be times that they will still experience those you said there, though maybe not really in a negative way sometimes, like for example they will get fear of something so they will panic sell and still be able to make a profit and if they don't do this, they might delayed on making a profit or they won't make anything at all.