Sales Skills & Negotiation Skills Selling Masterclass - A step by step guide to becoming a Master Salesman! Sales skills and negotiation skills, a beginners guide to business development for the sales consultant. The complete guide to mastering selling skills, sales strategies and sales techniques so that you can become a master Sales Consultant. Do You Want To Learn How To Sell Your Own Ideas And Products? There is no mountain that you cannot climb, if you master the art of selling. There are so many opportunities in life that are missed because people don’t develop good sales skills.