Union apprenticeship sign-ups near Nashville - what worked for you?

I heard of an apprenticeship with paid on-the-job training for people changing careers. I do not usually post, so bear with me. Classes are in the evening and work is during the day. What do you wish you had known?

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

Bring your transcripts and any proof of work history. They asked for both in the interview.