Sometimes not having worked for half a year can be seen as a disadvantage, unless you can show you went to school or something (and I personally feel that'd be a waste of time).
But that's just something to keep in mind. It doesn't mean you have to not do it. Changing to a more fulfilling career could easily be worth it in the long run.
Personally I'd try to work fewer hours (that's fairly common here but not everywhere) and learn on the side, but that's in no small part because I'd want to keep getting paid. And maybe don't try to be perfect before starting, but good enough to provide value and learn the rest on the go. I'd try to keep it under a year.