Shines-It got a job (or how he learned to stop worrying, and love the Wal-Mart :D )

[Teabaggins]

should be obvious but just in case:

shave
comb your hair in a neat hairstyle
fingernails trimmed
wear pants(that fit) on actual waist with a belt. do not sag. iron them.
tuck shirt in(button down shirt should be your actual size and not wrinkled)
clean shoes
have fresh breath, pop a mint in a few minutes before your interview or use spray, do not chew gum
sip some water 10 minutes before interview

relax and be yourself. be pleasant and courteous but not overbearing or fake. remember that the person interviewing you is a human as well and connect with them on a normal level without being too casual