Union apprenticeship sign-ups near Madison - any advice?

I heard of an apprenticeship with paid on-the-job training for people changing careers. The application needs a diploma or equivalent, a driver's licence and a short aptitude test. What do you wish you had known?

You earn while you learn, but the first year is tight. Plan your budget carefully.

Visit the training centre in person if you can. Seeing the classrooms helped me decide.