Ask experienced associates about the customer service standard for the job. Find out about customer service policies such as greeting customers, accepting expired coupons and offering free services. More senior associates can bring the lessons of years of experience and can show you what customer service skills are most effective.
Take any classes that your company offers. Many retail stores and service companies train their associates in certain customer service skills. For example, retail companies that offer free gift wrapping may teach this skill to all associates. Once you learn a skill in these classes, you can practice it on the job.
Role-play different approaches to customer service. With managers or other associates, role-play such situations as a cash register transaction, offering customers assistance on the sales floor or carrying a product out to someone's vehicle. Role playing will prepare you for questions you may not have considered.
Read books and online articles about customer service skills. These sources have plenty of information about providing good customer service. Simple skills, such as being polite or offering a factory service, can be learned by reading these materials and thinking about how to apply them in your work situation.
Another notion I would add to the list is to be good in customer service you must work a lot on developing your own happiness and social skills. Some of the best customer service people are those that are happy in their own personal life and are acclimated to society's nuances. If you want to become a great customer service rep working on yourself personally can go along way towards that.