Scaling out of positions: best practice or unnecessary complication?

Been trading $EURUSD and $GBPUSD for about a year now, small stakes, still very much in the learning phase. I’ve noticed a lot of more experienced traders talk about scaling out of positions as price hits certain targets, taking partial profits. I’ve tried it a few times, but honestly, it often feels like I’m overcomplicating things, either leaving too much on the table as it reverses, or exiting too soon and missing a bigger move. My current approach is usually just a single take-profit level, maybe a trailing stop if I'm feeling fancy. For those who scale out consistently, do you find it genuinely improves your overall profitability and risk management, or is it more of a psychological comfort? And how do you decide your partial exit points without feeling like you're just guessing?