You can do it by argueing with others and putting their oppinions under the question. Off caurse, this means that you will have to know the field ,what you are critisicing and that means you have to learn new things all the time. When disproveing others, you will have to be logical and demonstrate your oppinion with the help of facts. Also telling which facts were wrong in your opponents talking. Just watch the NTs in here and you will get it. This is also a good way for Tp to become into Logical subtype. McNew is doing it now in here. Do others think that this works?