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Selling is a skill which a sales man hones with the passage of time once he is exposed to different types of customers.
Biggest and most helpful technique is just don't shy away from selling let it be to the most difficult customer who is really a hard nut to crack.
Consider a salesman is a just born kid who has to reach different milestones in life.Starting with crying before mother just for a feed of milk and keeps on crying till his/her need is fulfilled by mother.