2 years ago I knew nothing about CRT's - Since then I've had a tonne of fun learning about them, modifying them, collecting them and repairing them. Now I have probably two dozen. Maybe more. I'm about 5-10% of my way on my journey to mastery, still so much fun to be had and so much more to learn
If you just want a working monitor then no - this is an absurd waste of time and money. it will be 50x cheaper (I kid you not!) to just pay someone to fix it.
If you want an awesome fun hobby that is gaining momentum, has a really good community, and has a tonne of awesome learning material available for free then yes absolutely get into it.
There is a bit of a steep learning curve right at the start with the whole Not Dying thing, but once you learn the basics of electrical safety it's pretty smooth sailing from there.