Re: Misleading @elsergiovolador
I think you are making assumptions about how enthusiastic enthusiasts are. From what I know, in order to replace BGA chips you really need:
1. A board heater
2. A hot air re-work station
3. Possibly a board magnifier or appropriate micro work microscope
4. The correct BGA templates for the chip to form the solder balls
5. The correct solder paste
6. Flux, tweezers, de-soldering braid, scrapers etc.
7. A ultrasonic board cleaner
and on top of this, you need an appropriate clean space with ventilation and light, a certain level of dexterity, and quite a lot of patience.
Whilst you could, with a bit of luck, get away without some of these, I would suspect that your failure rate for repairs would go up if you didn't. And many people would only do this once a year at most.
It may be possible for a school, or maybe a group of schools to get together to put together a workshop containing these things, But I suspect that for all but the most dedicated enthusiast, this level of outlay would be spent buying another computer. A lot of the YouTubers (with the exception of people like Louis Rossmann, who work out of a repair shop) shy away from serious soldering jobs of BGA and SMT components.
It's certainly not something that you would do on your kitchen table in an evening. No, most people are at a level where they will remove some screws, maybe a little glue or double sided tape, and undo clips to replace components, and not go any further.