The selection process itself can be difficult, but then comes the interview. This can throw up all sorts of problems for candidates and can be make or break in relation to a role.
An interview will inevitably go well if you are prepared and confident. You do not necessarily have to answer every question correctly, but if you are responding in a confident and acceptable manner then you will impress your interviewer. Be prepared about both the company and the role and if at all possible, your interviewer.
At the interview stage, a future employer will be considering not only your experience and qualifications but also the manner in which you present yourself, your skills abilities and personal qualities that may make you a match for the company and the role, so it is crucial that you present yourself to the absolute best of your ability.