I sold Mopar Performance Part for over 15 years of my life....it's not a easy job. Here are some helpful hints that I have learned over the years:

You must have faith in the parts that your selling or your nothing buy a lier.

Treat people the way you want to be treated. It sounds silly but it does work.

Customers will respect you if you run the parts that you sell. I had a 440 Duster for years and ran many of the same parts that I sold. This way you can give first hand knolage of the parts you sell.

Be honest....be honest....be honest. If there is a part that you sell and you don't like it....don't sell it and tell the customer why you don't like the part. By doing this you get trust from the customer and that my friend is the best selling tool you can have.

Good luck to you.