To get a real idea on this topic one should list what he currently does and what he’d want to do.
RONRSR says DENTIST. Is he currently a peditrician who finds it too hard to always be availabe for every Mommy who thinks their child might have TB because he has a daiper rash; or is he a cardiologist who has seen too many patients die (ch”v) or is he a musician who finds the music too loud at weddings; or maybe she is a at home mother with a husband a Rebbe who hasn’t gotten paid in three months and is finding it too difficult to cope on one (no) salary.
If you catch my point, it better to say, “Currently I am a garbage truck driver, but if I had to start all over again I’d love to be a microbiotic scientist working on sabatoging Iranian nuclear advancement of the Arts!”