Are suggestions enough for increasing self confidence?

There are many times when simple suggestions prove ample for a client. But when it comes to self-confidence, it usually takes more than a single session of positive suggestions to set right the issue. A person lacking in self confidence means he has low self esteem issues; and there must have been a trigger in the past that lowered the client’s self esteem. In such cases, the effects of the triggering event and the subsequent affecting events (if any) have to be resolved before giving positive suggestions.