Union apprenticeship sign-ups near Dallas

The training centre near Dallas opened applications for apprenticeships in electrical and welding trades. I worked as an electrician's helper before this. The application needs a diploma or equivalent, a driver's licence and a short aptitude test. What do you wish you had known?

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