fair enough - but what I tried to say is that the list of DON'Ts is often different for different people and conditioned on their individual experience (and their trading style). For instance people often say "do not add to losers" - not necessarily a good advice under all circumstances....etc etc
Never follow anyone else's rules. I violate about half of the rules put up there and I am profitable. Other peoples rules can only be suggestions until you decided that they work for you. Suggestion #1 trade as small as you can that you will still care about. Suggestion #2 (Works for any business) Keep costs down.