Toyman! said:Do it again.
Pick something that is underserved or not offered at all.
It can be lawn care or pressure washing, or computer repair, or any number of things.
There is a kid near me who makes pretty good money replacing phone screens and batteries.
To complement what Toyman (and lots of others) said, here's a little-known secret: don't buy any equipment that you can rent.
Here's another one: you can rent almost any piece of equipment ever.
How did my sandblasting company become a construction company? Home Depot rentals. I should have started by renting the damn sandblaster, just to mitigate some of the start-up risk--mine was a former United Rentals unit itself.
I have a friend who will, when there's a snow storm in Virginia, rent every single piece of equipment he can find in a 200 mile radius (biased towards Virginia, of course), round up all his buddies with their trucks and trailers, and drive down there. He'll plow, scoop, and tractor his way to more money than you'd imagine. He pays his friends well for their work, he pays for the rentals, and then keeps the rest.
If I lost my job/career tomorrow, I'd be in Home Depot tomorrow; or browsing United Rentals, to see what equipment there is to rent, which equipment I might find interesting to use, and then start looking for work where I'd use that equipment. Next, the website would go up and I'd start advertising. I promise you, I'd be working next week. I can't tell you what I'd be doing, but I would be doing something, and I'd probably be pretty happy doing it.

