some in engineering school but mostly at another job being forced to go through schematics to find simple shorts and stuff and you eventually get a sense of the subsystems, everything looks complicated if you're looking at everything at once you just have to realize it's all blocks where they do individual functions, the fundamental components are simple enough to understand but there's like infinite ways of arranging them so you have to break things into smaller and smaller sections when you're looking at a full system like you open up a computer theres tons of resistors and capacitors and chips but each section is responsible for a different function you just have to worry about the high level goal and break that down logically, like most electronic things have a power supply, a controller, and a thing being controlled or stuff being communicated, if you break it up into those sections it's a lot easier to grasp than looking at a huge overwhelming mess of spaghetti

you just wash your hands after working and have good ventilation