this is absolutely true.
At every stage of your Bitcoin accumulation journey, there are major factors that could stand to bother you.

At the start, it's more of sorting out the right plan to work with which is basically a function of  your financial strength and you might just need to decide if you're financially strong enough to buy in bulk or settle with the DCA method and when doing this, there is really no need to bother about any sort of emotional or psychological whatever. You have to face the visible fact that your finance is either strong enough to buy in bulk or isn't.

At the point when you've accumulated a good amount of satoshis in your portfolio and then the market is bullish and you're also at a good profit, this is when you've got to work on your emotional and psychological prowess that will help you become disciplined and patient enough to building a good portfolio. It's not always an easy thing to keep your emotions in check when you're in profit and what some persons would normally do is to sell out some of there holding and reinvest it whenever there is a DIP. But the issue has always been if the market will go as DIP as they would normally expect it to and the obvious answer is , even if it doesn't, as long as you're buying to hold for much longer period of time, you're definitely going to be in profit.