Trades apprenticeship applications open in Kansas City - what worked for you?

I heard of an apprenticeship with paid on-the-job training for people changing careers. There are 13 people counting on me, so I am trying to be careful. The application needs a diploma or equivalent, a driver's licence and a short aptitude test. What do you wish you had known?

Visit the training centre in person if you can. Seeing the classrooms helped me decide.

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