Practice means saying the words out loud, not to memorize, rather just to have experience saying the words. Thinking about what you will say is not the same as saying what you will say. Bottom line, employers want people who will come to work on time, every day they are scheduled, who can get along with the other employees and are willing to do the job the way the employer wants it done. In essence, every job requires on the job is training. New employees must learn the rules of the organization and how to get along with the other employees.
Every job is hardest at the beginning and gets easier with experience.
Before asking for a job become a person the employer knows or at least, establish a level of comfort. Before asking for a job, be able to speak intelligently about the organization. After asking for a Job, Do Follow-up. A short thank you note reminds the employer that we have applied for a job. We can express appreciation for the courtesy of an interview and confirm that we are interested in the position.