You may laugh but I went out on the road with no training or knowledge of electrics and did just that a few times when working in building services. A flash, an impressive bang and would then say, there's your problem mate,pointing to whatever remained of the component.
I'll be back.
(What else could you do when you have a wife and children to support).
This gave me time to think about it, get the part return and fix it.
Believe its called "Learning on the job".
Could you do it nowadays.
Did you know that you can run stuff using the earth if the VIR neutral is a bit iffy.