Sure there are always edge cases and unknowns. Additionally we each have a limited capacity for condition variability. All of that can be qualified away by people who have prior experience. By prior experience I don't mean ample work history (vague), but people who have participated in a given scenario in the past (highly specific).
The problem space there comes from only two considerations. The first of which is a team where nobody has the required prior experience. In that case confidence drops in proportion to the increase of uncertainty, but that does not necessarily result in an increase of anxiety. Some people and/or work cultures are much better positioned than others to confront stress directly without distressing towards anxiety.
The second consideration is the collision between prior experience and evidence. In this case both the evidence and the prior experience must be considered and an alternate conclusion must be reached. That alternate conclusion is the definition of truth according to John Stuart Mills.