I have fed my family, not always as much as I'd like, but last few years $50K plus with the overtime included. Spent the first 8 years buying tools, about as much as a house payment. If you can find the tool deals at 1/2 price for students definitely go that route.
Never have had to worry about working, but sometimes it was like pulling a wire brush out of their rear to get paid. You will be everybodie's B----. You are the one on the job till it's done, and the one at fault because it broke, and the one at fault because it isn't fixed yet. Yet at times it has been most enjoyable, like the times you drive 200 miles to work on a machine that hasn't run in two weeks, everyone from brother Bob to cousin Phil has worked on it, and they went to diesel school by george, so son if you think your going to pull the rabbit out of the hat you better think again. Then you get it up and running in about 5 minutes, and they look like they just swallowed their chaw. That part is pretty good.
I recommend if you can't get into something like Operating Engineers, that you try to stick with some one big like Cat, Cummins, Deere, or Detroit. I'm really worried that Cat is going to come up with something big technologically that will put everyone else in the dirt. I figure they have the rescources to really put some money into R&D, hopefully I'm wrong.
Last few hires I have seen at Cummins Northwest, you either need to have a certification, degree, or verifiable experience with a good report from the Cummins Mechanics that have seen your work. Some of the bigger outfits have scholarship programs to help you through school. I believe Cummins Northwest has one but I do not know the details of it.
A Johnson