Very doable. That TV off gizmo might be a little advanced. And you may want to learn good soldering techniques from YouTube, etc to help younger ones.

You might even look into auditing a class at your local community college or trade school if you're interested in the troubleshooting side of things.

TBH though lots of people that troubleshoot these days do less and less component level. Lots of "board swapping."

That's not to say you can't do so.

If we get into another "great depression" hard skills are tough to beat. Saves on repair/replacement too. My wife and I have fixed numerous appliances/devices.