I can imagine!! i’m an educator/trainer and in my manual I always give advice and there is a section about purchasing hair ans which hair type suits clients Hair, someone with poker straight hair generally would be better off with European or Brazilian hair as it blow drys straight, someone with wavy hair would be better with Indian hair as it has a natural wave to it they can leave it to dry naturally and it blends in seamlessly, some Russian hair has a slight kink to it but generally it’s straight. most good quality hair is straight, from experience it’s very important to Match the clients hair natural texture to the texture of the extensions that you’re fitting, in your consultation and you will need to advise customers of the different hair types which has different costs to it that there are so it is always important to try and get some sample hair to show clients, I think as a trainer it’s important be able to pass on the knowledge of which Hair type will suit which persons hair, send me a message if you need any help or advice x