it is always we engineers who have the first hand knowledge of whatz going on in the scene. depends on how well we know the aircraft/systems then we put forward options. if things no acceptable to us, ring the maintrol guys.
how to distinguish newbie or experienced engineers is the way they handle trying situations, hence using their professional knowledge. if one has to use cell phone all the time, then we all know who he /she is.
In engineering, knowledge prevails. If we have confidence of what we are doing, stand on our feet.
Whatz most most important is safety , best accompanied by on time performance.