The secret of selling: it lies in the ability to get the customer's point of view and see things from his angle as well as yours.
Thats simple logic one should follow to be a good sales person.
I dont know whether you looked at my previous postings on "Retail Customer Service & Selling Skills". Have a look at this thread, it is pretty elaborate and provided with Facilitator's Guide as well. I am sure you can pick up the usable information from there. Good Luck !!
From India, Hyderabad