Aaargh domestic repairs - the bane of my life. I don't do domestic or general commercial wiring so I don't run ap against faulty washers or dead fryers. But people know I do electronic stuff so they try to sneak in moody gadgets for me to fix 'if I have a moment.' How many moments do they think I have?
The problem is when you don't do much of it. When lots of the same models are going through your hands on a daily basis, you can get very quick and accurate at diagnosis and repair. From my days at university and shortly after, repairing IT / AV / music gear to earn a crust, I can still remember many of the circuits, component values, stock faults, mods, tweaks, and traps for the unwary even 20 years later. I would know which spares to carry in stock, which other parts to replace when one part fails (to avoid callbacks), which items to condemn on sight as more trouble than they are worth. If you are only doing it occasionally you don't get the benefit of that experience; jobs take longer and are more likely to bounce back.
The problem is when you don't do much of it. When lots of the same models are going through your hands on a daily basis, you can get very quick and accurate at diagnosis and repair. From my days at university and shortly after, repairing IT / AV / music gear to earn a crust, I can still remember many of the circuits, component values, stock faults, mods, tweaks, and traps for the unwary even 20 years later. I would know which spares to carry in stock, which other parts to replace when one part fails (to avoid callbacks), which items to condemn on sight as more trouble than they are worth. If you are only doing it occasionally you don't get the benefit of that experience; jobs take longer and are more likely to bounce back.