I was a gunsmith ( now retired) my ex wife has been a truck driver for the last five years. She makes more per year than I did as a gunsmith most years. Other things to think of with family is insurance and such. I went to school at 18 long before the family came along. I'm not sure how it would have worked out the other way around. And as all the other gunsmiths on here will tell you there will probably be part time / second jobs along the way. Good luck.
Keep up with the trends, avoid the fads, take your time and do work you can be proud of always