The interview is the most important step in finding a job. This is your only opportunity to make a first impression on a potential employer and make a statement. You won't have much time to prove that you are the right candidate. Therefore, it is important to think ahead how you will take advantage of the opportunity.
Preparation for the interview provides an opportunity to gain an advantage over other applicants for the vacancy. Good training demonstrates your motivation, which is very important for the company. Remember, too, that a positive attitude often plays a decisive role and is the key to success.
I completely agree, successfully passing an interview is one of the hardest tasks for people looking for their first job. You can only do it with practice, unless you want to try applying for a remote job opportunity where you only have to attend an online interview. It was much easier for me than conventional office interviews and as a result I was able to quickly start working a good job from my home.