I'm with
OS on the first 4, viz...
Yes (Common)
Yes (Common on long haul)
Yes (Part 1 Rarely, Part 2 occasionally, Part 3 Frequently)
Yes (Common amongst the "Mustang" engineers, they fix it with their P51 (Parker 51) pen)
For the others...
Yes, and
Yes!!!!
Finally, there are times in every career when being "good" isn't enough. You DO need an element of luck at other times. However, if you aren't "good" the chances of "luck" seeing you through will be GREATLY diminished. Thus, being "good" is a really good start!
