I use to do that 22 years ago, and kick myself sometimes for years of missing the huge moves, take out half position and leave the rest on at breakeven if you got in high enough. I have often taken off half at decent first targets and then watch the rest erode away, but impossible to get the trades that last years, toughest part if not checking on it much, once or twice a week.This is where I close my short position, take the money and run.