Union apprenticeship sign-ups near Salt Lake City - any advice?

The training centre near Salt Lake City opened applications for apprenticeships in electrical and welding trades. Classes are in the evening and work is during the day. What do you wish you had known?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

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