I also agree on this issue. Most sales resistances are caused by the salesperson himself.
I had an experience when I was still in college and worked in summer selling books. There are 10 people in that summer job and we worked in pairs. Everyday we go to one area and try to visit every house in that vicinity. I and my partner happen to visit a house that has been visited by our colleagues that were ahead of us. The owner of the house didn't even look at our books because the person who is selling is just looking down and talking to the ground. The owner of the house just said goodbye. On the other hand, when I approach him, I greeted him like I knew him very well and let me and my partner enter his house. We presented our books and we got a sale.
Buyers are also humans and they are not different from me so why should I be fearful to them. I just need to let them see that they need the product that I am presenting them and they will eagerly buy it.