I'm always scaling out of trades. That way you can't lose. If it then goes against you, at least you locked in something. If it goes your way, you still have bullets to play with. Don't get greedy.
Most floor traders tend to make money twenty days of the month.
Then in the last two days they get blown out of the water on a big trend day during which other traders are buying breakouts and cleaning up. When swing trading, you truly don't want to fight a trend day - the market is going to tell you quickly if your play is right or wrong. And if you're wrong, don't fight it. Always go in with a game plan. Anytime market action deviates from my road map, I'm out of there because the market is not doing what I expect it to be doing.