Well-versed in all the products they strive to sell, sales assistants will guide consumers on what item may best suit their needs. Not only that, they’ll keep track of store inventory, manage receipts/refunds, clean their premises, update sales promotions and maintain security by being vigilant for possible shoplifters. No formal qualification is required to undertake a sales assistant job. Once you start a career in sales, it can lead to a supervisory or a managerial promotion. The average salary for a sales position job is £8.77/hour.