Union apprenticeship sign-ups near Honolulu - any advice?

A local apprenticeship programme is taking applicants for the next intake. It has been weighing on me all week. 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.

Keep everything in writing and save the confirmation numbers. It saved me later.