Is it possible to rebrand to administrator / programmer job in (very) late 20's?

Hey,

I am unhappy with my current job and I seek the strategy to improve my life situation. It took me a long time to sort out my personal problems, so I am rather late to the party, but I finally feel ready and capable to try and learn something new.

I have basic knowledge of how GNU/Linux works and very limited knowledge in C++ programming. I enjoy spending my time on learning new things in that subject and I would like to use it as an advantage to earn money doing it. Yes, hobbies turned into work sometimes ruin it, but I have no better ideas at the moment.

I already figured out that costly professional courses may be a waste of time and money or at least that's what I've read online. The only truly good thing is that they sometimes offer help with finding job at the end of the training, which might make things easier. I am not sure what to think about it.

Is the perspective of choosing a job in the IT field and changing a job realistic at my age and without any formal education? If so, do you have any advice for me on how to even begin the journey?

I know that I did not specify anything, but I'm trying to get an advice before I make any decisions and I will be happy to receive any suggestions.

Cheers!