I think a career plumber has a head start on everything else. If you’re self motivate, can at least manage yourself and family well, you’ll make money hand over fist as you’re the one that gets called at 2:00 am Christmas morning to fix the toilet flooding.
My brother in law is a plumber...the only time he’s lost money is when he did my house plumbing (all copper pipes) and when he comes over to my house to fix stuff. Guy carries around a wad of bills in his pocket you wouldn’t believe.
I have to reciprocate with him on electrical and electronic repair work.