Read this for my senior capstone class. 
The gist: 

1. Put the client’s interests/goals first. This is not an option; it is the only one. 

2. Don’t listen to react. Listen to listen. 

3. Everyone needs to be on the same page. You and the client should know and agree on what you’re expected to do. 
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The Quick Guide to Being a Trusted Advisor:  
 

1. Listen to everything 
2. Empathize (for real) 
3. Note what they’re feeling 
4. Build that shared agenda 
5. Take a point of view 
6. Take a personal risk 
7. Ask about a related area 

8. Ask great questions 

9. Give away ideas 

10. Return calls unbelievably fast 

11. Relax your mind