I have very little soldering experience, but every once in a while at work I have to use a soldering iron to install heat-set threaded inserts into 3d prints.

The little machine that controls the soldering iron only has a power button and knob, and no indication that it is heating up or hot or even working. Each time I use it I convince myself that it isn’t on and have to test it. And each time I briefly consider using my hand. It’s always super hot.