I'm doing training on how to trust people. The first lesson was, look at someone you trust, and why. Even if I don't trust them completely, if it's more than 50%.
The example I looked at was my mechanic. 1) I've been going to him for years. 2) When he could screw me over, he almost always goes the opposite way, and helps more than he needs to. 3) When he does something that's a little less than kosher - like using a used part instead of a new one, which is fine - he always tells me, he's always up front about it.
I've just started, and that's a weak example (I have a very strong one, with a lot of emotion behind it, but I think I'll keep it to myself). But that's where we're starting, looking at what I do and know.
It was also recommended that I read this book:
It describes how to learn about and trust your gut instinct. My therapist is a childhood trauma specialist, and usually works with children or their parents, so it is a little off topic. I haven't read it myself, so I can't say much about it. But it was my homework.
Edit: The link didn't work? Or at least I don't see it. The book is called Protecting the Gift.