Although the path to becoming a dentist is quite vigorous and expensive, general dentists (and dental specialists i.e. orthodontists, oral surgeons, etc.) typically make a desirable salary with lots of flexibility in their work schedule. As a dentist, you can choose to work as much or as little as you would like: part-time, full-time....you can even become your own practice owner and set your own business hours. The price of dental school is very high, but if you view it as an investment in your career and you are willing to pay off a monthly student loan balance as if it were any other monthly bill, you can live a financially secure and socially flexible lifestyle. You can pay for dental school entirely with student loan money as well, so you don't need to worry about having a side job to make tuition payments while you are in dental school. Happy to answer any questions you may have.
If you're looking to make your own hours, look into starting your own business such as hair, esthetician, real estate, contract work (i.e. logo design), selling a product. Also start investing now to get your money moving and working for you!
If a job is "easily navigated", has flexible hours, then lots of people will want it, and the salary would go down.
So you've got two competing concepts here that work against each other.
My advice would be to not worry too much about getting a high paying job. I'd rather have a lower paying job i enjoy than a higher paying job i hate.