The clock thing above isn't a fair comparison, a computer doesn't fall apart into two hundred pieces once you unscrew the case, there are just a few discrete components and most of the time one just replaces one of them completely, almost nobody attempts to repair surface mounted components with a soldering iron, even at the repair shops. You don't have to have any special knowledge to do those things, just know a few tricks, ironically mostly related to opening things the producer didn't want you to open, and handle it with some care.
By the way, am I not, accidentally, at a site called "Hacker News"?