SYNERGISTIC SELLING: How To Be a Great Salesperson - 3 parts of effective selling and sales success: Sell Yourself, Sell Your Company, Sell Your Product

Selling is about solving customer problems.
Your prospective customers may be aware of these problems, or you can bring these problems to their attention.
Your prospective customers may face these problems currently or they will face these problems as the situation and their needs change.

People with winning self-images constantly outsell those with low self-esteem.
Your sense of your own importance will determine whether your prospect develops a positive image of you.
The prospect will tend to see you as you see yourself.