People often talk about emotions causing investors to sell low. Do you feel tempted to sell once you've earned from an investment?

The best way to do this is to always have a well-defined investment objective before you start to invest. Through this process, it keeps your emotions in check whenever the temptation arise.

For a single stock, you may not always benefit from "buy and hold". What goes down can go lower. Moreover in reality, dollar cost averaging stocks does not work all the time.

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Dollar Cost Averaging Singapore: Does it really Work?

Therefore, it is best to spend quality time to define your investment objective. This keeps us steady when waves rise.

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Prices go down- This tells me you have yet to develop an investor's mindset. Prices will always go up and it will always go down, that is just how stocks work and in the short run no one will ever know where prices are heading. With a investor's mindset, you should see stocks as businesses and businesses generally do better over time (SOLID FUNDAMENTALS) By identifying the right stocks (businesses), you are bound to gain if you hold it in the long run. Do note: You should only INVEST in stocks if you plan to hold them for at least 3-5 years as gains will not be realised before that. If you hold stocks for a few months or even a few weeks, that is not investing, that is being SPECULATIVE and that is not what investing is. Another difference is trading, and beginners should never attempt to do so as you need to have a good grasp of technical analysis as well as identifying macroeconomic trends and constantly staying up to date. Just my two cents.