if you want to train while working full time then I can't think of a better entry level profession than teaching. Just teaching. Not teaching and coaching. And not teaching with a bunch of other extracurriculars. Just teaching. Do the minimum required for your superiors to think you do a good enough job not to fire you.
I can't think of a better profession for having a work/life balance while still getting paid enough to live like an average adult. It really wouldn't be any tougher than being a high school runner. Summers off, the majority of your workdays you're done by 3 or 4pm, at least 1 hr of prep per day within that already shorter workday than most of us have, a couple weeks off at christmas, a week off in the spring, most major holidays off, and then you get personal days on top of all of that to use here and there.
With tax, audit, and many other professions they actually expect you to put your job first. While most of your coworkers and superiors have other interests outside of work, you'll find that very few actually have something more important.
My best comparison is that if you're trying to train while working then you'll fit in and succeed just about as good as that kid on your college cross country team who was on the team but always leaving early every practice for theatre stuff, or to be a dorm advisor, or for church events, etc. The rest of the team is giving 100% while that kid never put running first. Coach didn't put up with it for long. Teammates didn't accept it totally. And that's how you'll be perceived at work in a lot of industries in my opinion. Just seems really difficult at best trying to make it work based on what I know. Again, you can have interests outside of work. But only to a certain extent.