Me neither.
But let me tell you that the hardest course I ever did myself was REME Artificer training. It was hard enough even qualifying to get on the darned thing in the first place. Many good guys didn't even pass that first hurdle. That was back in the days when "only the strong" (committed
etc.) survived. And the evil sods in charge even failed blokes in the final weeks of (what was) an eighteen month course. In fact, they watched you the whole time, scribbling crappy notes in their little notebooks, ready to be dragged out again at "judgment day".

Nothing else that I've done, either before or since, was as demanding as that. And (by the way) it was a marriage breaker too!
It was the only thing I tried in the army that I seriously thought about "jacking" (as in, "is all this really worth it"?) ... rather than simply being chucked off! Ha, ha.

Anyone who has successfully gone through all that gets my immediate respect!
What's all this got to do with circuit board repairs? Not much really ... except (as I said before):- "it's all a matter of attitude, mindset"!