I am a seller by nature and it usually happens to me that there are times when you meet buyers who are difficult to deal with because of their character or because they do not want to pay the value of the product. the most interesting thing to sell is the skill you adopt to have mental agility and communication, in the same way your advice is great, thank you very much for sharing. I would like to read your book I could send it to my email soydiegorojas@gmail.com