We all sell. We sell things for money, or we sell people on our ideas, are sell them on doing something.
In order to convince someone, you have to be totally convinced yourself.
The first sale you have to make is to yourself.
To the degree you believe in yourself, is the degree your customers (others) will believe in you.
Are yo completely sold on your product/service/idea?
Is your (sales) team?
Excellent point! No one wants to buy from someone who doesn’t believe in their service, product, team, or themselves.