Doing any sort of retail work will help you develop communication and customer service skills. Working part time in a nail bar or beauty salon will also help you learn about different treatments and how to look after customers in a more relaxed environment.
You can find out more about how to become a nail technician from the Hair and Beauty Industry Authority (HABIA).
If you have the right skills, you could set up your own business. This could be a mobile service or a contract to go into leisure facilities like gyms, hotels and spas.