It is anything from 0-100%, depending on your person, skills, luck, work, family, stubbornness, economy, network etc. etc. etc. etc. ......
Bottom line: You have to spend € 60.000 or more, sorry, most likely a lot more on something you have absolutely no idea if you get a job afterwards. It is a risk, but calculated risk. There is no easy or short answer to your question ..
- madman