How do I handle complex jobs that are still beyond me?

You service most turbines well now, so the big overhauls that still defeat you feel like a spotlight on what you cannot do. They are not. They are simply the next level, and no one reaches it without a stretch of feeling out of their depth first. Complex jobs are learned by doing them beside someone who has done them before, not by waiting to feel ready. Ask to be on the next overhaul, even in a smaller role. Watching how a veteran breaks a huge job into steps teaches more than any amount of solo worrying. Put your name forward for the next complex job you can join. You grow into hard work by standing near it, not by staying where it is comfortable.