I've been fortunate to get the jobs I've wanted & I believe the same can apply to everyone if the right attitude / disposition is maintained.

1. A +ve attitude will translate into confidence / approach @ an interview - you radiate warmth that attracts the other person to want to know more about what makes you tick - on the other hand, a -ve disposition does the opposite - it repels people & this is shown when you aren't confident - nervousness is a function of being insecure - you've already given up on yourself, let alone others.

2. Always go for an interview prepared - learn about this coy you want to be part of - what's the value you'll add if / when taken - what innovation will you bring to the table - when you have an idea what the coy is all about, you'll be able to align your goals to theirs & your passion will translate into you being knowledgeable about their brand, products / services & culture to be able to ask necessary Q's that'll show just how much you understand of their operations to be able to fit-in.

3. Always remember - you are only as good as your 1st impression - so make an effort to impress. Impressing doesn't mean expensive garb, flashy cars etc (face it, if you had those, you'd be on the other side of the table), it means ensuring you appear easy on the eyes - if you haven't got a suit - no need to fret - wear clean clothes & ensure you radiate confidence - no employer wants a well suited dumb ass,