"IMPORTANT TRADING RULES:
1) We never get long or buy in a downtrending market.
2) We never sell or go short in an uptrending market. "
I sell uptrends and buy down trends all the time. I have a whole set of rules that are specifically designed to counter trend for short bursts. They key to contrarian trading is making sure you stick to well proven reliable set ups, and to make sure you are not staying in too long. They are generally short rides during the trend's corrective phase only.