Basically it's what in your application that decides a lot about your chances to get a job.

First remember that at least here in germany an application for a job often first goes thorugh a secretary before one of the bosses even sees it (true for medium to big companies). So make sure its clean, well written not wrinkled. Or else it will go to the paper equivalent of /dev/null.

Second if you get invited to a talk do some more research about the company. Preferably such things like workplace climates and dress rules. Choose your clothing for the interview accordingly. In regards to clothing choose something that fits but most important something you dont feel ridicoulus in. Chances are you wont be very good at hiding it if you feel it and that makes it so much harder to establish an impression of feeling secure about yourself and your abilities.

Third during the interview always try to remain calm and secure. Some companies try to confuse or immitade an interviewee to see how he reacts under stress. Often used practises for this are setting the interviewers chairs up so that the interviewee cant see them all at once (wide half circle) and spewig questions at them without giving enough time to answer them. Just remain calm then and answer each question as good as you can and dont let them drag you in the speed question/answer game. Oh and of course always pay attention and look at the person you are talking to, but dont stare into their eyes all the time. Many people find that aggressive.

Just some tips from me for applying. hope it wasnt too much bullshit to read ;)