I've often read a simple strategy of buying stocks or funds over a period of time: spread it over time with fixed amount of dollar in each period. Since the price fluctuates, fixed dollar amount means that you'll buy more when the price is low and you'll buy less when the price is high, which sounds a pretty good strategy.
How about selling stocks. For example, employees often receive a significant number of their company's stocks as compensation (e.g. vested RSUs) and may want to sell those and reinvest in a more diversified manner. Selling all at once seems very prone to risk of market fluctuation - for example if the price happens to bottom during the sale.
On the other hand, the fixed dollar strategy above doesn't work, because it means selling more when price is low and selling less when price is high. Is there a good strategy for selling that is simple to follow, perhaps analogous to the buying strategy above?