Trades apprenticeship applications open in Spokane

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

The aptitude test was mostly maths and reading a diagram. Free practice tests online were enough for me.

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