Apprenticeship openings for electricians and welders - first time posting

The training centre near Boise opened applications for apprenticeships in electrical and welding trades. I have read a lot of threads here and could not find my exact situation. 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.