They hire almost anyone. Sound professional. If you aren't outgoing don't fear, they will hire you and let you drown in Sales.
Stay home don't waste your valuable time. If you are currently unemployed then make sure you point out your telecom and or electrical skill level. They do some training so all you need is a smile and a heart beat. Ask questions about the day in the life of an employee. keep positive and smile lots.
Show up, have an outgoing personality.