As Shanwick shanwick has said, each Captain ( and F/O ) has a comfort zone. If you will it is a box. Within this box there is an individual acceptance that they can cope adequately with their own performance and the performance of other crew members. This box is not rigid, and it will expand to some degree, with experience and it will change shape with experience. A Captain will only be confident if at any given time the operation keeps them within this box. Sometimes situations will occur that take an individual towards the edge of this box, and it is natural and usually desirable that caution will steer the individual back to a safer position.
For new Captains this box is understandably going to be restricted. This will be the case when the individual is new to the role and again if they are new to the type. A good and experienced F/O will recognise this reality and hopefully adjust their own responses to accomodate this. This is part of the learning curve, because F/O's also have dynamic comfort zones that an experienced Captain will need to recognize and hopefully will try to accomodate.
Sometimes you just have to be patient.