Trust on customer Or own self is need most for getting good result of business ?

Rather than trust on customer or Own self. One should concentrate on imporving quality of prouct or service. Add some value in it. In turn, you will retain your customer, by which you will gain trust on your self as well as your product/service. Be more customer centric and try to gain the customer satisfaction. To Conclude, Customer Satisfaction will be the key here to get trust on own and customer. 

At the outset you have to have trust on your self that you can deliver what customer expects from you and secondly you will have to trust customer that after fulfilling his requirement he is going to be with you as far as business is concerned.

Trust is a very unique, sensitive & delicate issue. Of course you need to trust yourself but while performing to the expected standards. On the other hand; you need to show & make customers believe that they are very important & part of your business. If you do so, customers will gain confidence & trust in your company.