Trust is an interesting concept. Consider “do you trust this person?” or “would I do business with this organisation?”. Trust is something that can be developed over time, but where do you start, because without trust, you wouldn’t do anything.
In the end, it comes down to an understanding of risk and exposure of a situation and the controls that could be put in place to mitigate risk and exposure, or at least reduce the risk and exposure to an acceptable level.