Personally I agree with Becki, hair is a craft, a proffession, a constant art to work at and progress. I have been hairdressing for 18 years and it makes me mad when people think they can just do something and make it look as if any one can do it.
Hair extensions is a specialised field, you cannot learn everything you need to on a one day course, someone, anyone can go on a course for a few hours and get a certificate letting them go out in public doing hair extetions, it makes degredation of the proffesion.
I also personally think that hair extentions dont need to be cut in properly, the also have to be razored. Sorry to moan but I am seething.
As you can see from some of the pictures on site, hair need tp be properly sectioned, clean sections, not too much tension etc etc, you can ireprably damage the hair, scalp and follicles. Non proffessionals should not be able to go on courses, I hope they do check certification.