Referral from an employee, then a phone interview, in-person interview. I'd say assessment comes down to your personality, how well you work/communicate with others, an work ethic.
Previous experience? What role can you see yourself doing? What made you interested in construction? What is your past experience (non-industry related)?
I think a direct, honest approach is best. If you be yourself and show a keen interest to work hard and learn you'll have a good chance.