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

I heard of an apprenticeship with paid on-the-job training for people changing careers. I have read a lot of threads here and could not find my exact situation. Classes are in the evening and work is during the day. How hard is the test?

Thanks for writing this out. I went through something close to it 14 months ago, and it got easier once I kept a simple log of every call and form.