Job interviews are absolutely nerve racking and you want to feel absolutely comfortable in every aspect. Just like preparing what you want to say I also think the makeup you wear on the day plays a huge part. No potential employer wants to see caked on makeup, massive false lashes or bright pink lipstick........unless its a particular job you're going for *wink *wink!!
Hopefully this may prepare you in the makeup department. Keep your nails neat, clean with a soft coloured polish and dont go overboard with the jewellery!!!