How to behave during the most important first 10 minutes of a meeting

The truth is that the success or failure of a deal is usually determined in the first ten minutes of a meeting because during this time clients (either consciously or unconsciously) decide whether or not they trust you and like your product. And these are the main two factors in the decision whether to accept or reject your offer.

How should you behave in those first ten minutes of the meeting so that you increase to a maximum your chances of success?