It is probably times like these, where valuations are high and the desire to trade and invest is also at a peak, one needs to set some rules, both for investing and trading. As a first step, have a well defined set of stocks, where one would invest and trade. So, that one does stray into stocks which are moving up just because there is sunshine all over the street. This might appear conservative to some as it limits the scope but being conservative is a way of bringing in discipline, especially when it comes to trading. So, out of a total universe of more than 3000 stocks, how about having a set of 50 non - nifty stocks which increase the probability of you making money both in volatile and trending markets and also satisfy your desire to be a trader and investor at same time.