By Guy Adami, stocks editor at OptionMonster.Even in these unpredictable markets, sometimes the stars align. We've been talking about Cerner ( CERN) since early January. Then on Tuesday, in a post headlined "Cerner appears ready to run," we wrote: "Currently CERN has a short interest of about 14.2 million shares, or 20% of the float. If the broader market can build on the action we are seeing so far today, a short-covering rally up to $45 or so is not out of the question." Yesterday the health-care IT company made a high of $45 on nearly 4.2 million shares traded. Hopefully many of you folks have been on this trade, and hopefully many of you folks took advantage of the move to $45. Although I still like the story at CERN, the trade is over, at least for the time being. Does that mean the stock can't move higher from here? Absolutely not. But when you have an objective and a stock trades to that target, it's time to move on. Remember: Don't make trading harder than it already is. Don't get attached to stocks, and never make it personal. And don't overthink things -- action is always better than paralysis, as long as you've done your homework first.