I want to do other ppls makeup but i need more practice…how?

Okay so I am an independent sales representative for a beauty line and i know how to do makeup pretty well. I think i will sell my product better if i do other peoples makeup. But I have only applied makeup to to different types of skin types my ex-roomate who had acne now worse then before so harder to do her makeup if at all now and mine. I need more practice but i have few female friends that actually where full face makeup so i don't know how to practice on others to make myself better if there is nobody to practice on. I know how to do my makeup to a t but doing mine and doing someone else's way different can someone give me advice