Skelliewag has a great post on one way to politely tell your friends no
There is a way to turn the experience into a positive for both people. Next time you have to say ‘No’, recommend someone else to help.
Make this someone you know online (or offline) or someone you would like to get to know. Not only are you giving the person a helpful recommendation, you’re potentially sending a new client (or reader, or viewer) someone’s way.
Not only does this make perfect business sense, but it’s a great opportunity to network with people as well.