Therefore, when the price is trending downwards and when it is obviously below intrinsic value, do not harm your portfolio by selling to "protect your gains" or "to minimise your loss."
Instead, you should be brave and courageous (this can be very difficult for those not properly wired) to add more to your portfolio through dollar cost averaging or phasing in your new purchases. This strategy is very safe for selected high quality stocks as long as you are confident and know your valuation. It has the same effect of averaging down the cost of your purchase price.
However, unlike selling your shares to do so, buying more below intrinsic value ensures that your money will always be invested to capture the long term returns offered by the business of the selected stock.