I have a couple of tricks that I use. The first is the concept of scaling in and out, often also referred to as dollar cost averaging when referring to buying, but, in my case, also applied to the sell side. For example, let's say things double, well, that could be motive for selling 10% of one's holdings. The percentage amount depends on what you decide on. Three doubles turns into an 8x, and you'd still have 70% of the original position on. Three more and you're at a 64x on the original investment with 40% still on. This is just an example. Everyone needs to run their own numbers against realistic possibilities for each holding, but I'm sure you get the idea.

The second trick is the balanced portfolio theory. Let's say you have 10 holdings that each make up 10% of your portfolio. As one rises above a certain predetermined threshold (set by you), let's say 30% of total portfolio makeup, for example, that particular holding automatically gets sold to bring it back down to say only 15% (again, you set the numbers ahead of time) and those profits are redistributed to those holdings with the lowest portfolio percentages. Decision making happens prior to the events so that once thresholds are met, there's no emotion involved. I spent the better part of 2017 popularizing this in real time and it worked out well for a lot of people.