The thread you posted was posted hear recently.
I would say one of the most important though is more investigative skills and patience. I will find the link and post it for you later, I do not have the time to look for it though.
Lets assume you are licensed though, and a client calls and asks for some info. Who you going to call? Find the info and present it with confidence. You know the thread is here, dig for it, you are taking the easy way out. Don't rely on an easy way out, you will never make it that way. As I said though, I will find the post and send it to you, later on tonight.