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That would require those clients being able to determine the difference between good advice, bad advice and luck, and not be fabricated or exaggerations of the truth. I get it though, you can keep asking questions until your confidence is at the a level you can accept, but I feel that if you need to go to the a-z of profession X to get service Y you've already lost, unless you know more about Service Y than the people delivering service Y, in which case why are you even outsourcing that role?
I suppose they could sense check your plans, offer 'have you considered' type suggestions.
I would ask for references from past clients if I was getting big dollah advice, no?