Side notes, for oneself 1: how, the what. And see eg. Stephan Schiffman, selling is about 5 things. What the customer does, why, how. What is the problems they are facing, and how you can make the things they already do, in a better way. Selling is not pushing. It's helping, but before you can help, you have to understand somewhat deeply the things that already have been done by client.