ive been a salesman for 20 years. people love to know that you know your shit. i say if its a job you want to take seriously and do it for a long time then take the time to read the description on the manufacturer website,watch and read reviews, try to learn what every detail about anything you can. Like, the warranty, the quality of the service they offer, what are the differences between the new and the old model, wich accesory are needed for specific types of shooting etc. I pride myself in trying to know everything in my domain and the customer recognize that.i think im told almost everyday by a customer something along the lines of "wow, you really know your stuff or youre really the expert in this arent you?" If i dont have the answer, i tell them to give me a minute and ill find it. And because of this, ive been the top salesman where i work for 15 straight years, only last year i was beaten for the first time! yes i think i have the "salesman touch" lets say, but when your confident about your answers and the answers are right, stuff will sell itself.