i have also done a four day course on hair extensions and i am not a hairdresser then i followed up two day cutting course thats a cutting courses to learn how to blend in hairextensions only ,ive not learned how to cut a style because that is not what i want to do, i only want to do hairextensions, and the same as you i am very proud at how good my hairextensions are ,and im an perfectionist and would not let them leave untill there were perfect they aso get aftercare, the school i went to was in essex balmain wich is a very retible company run by andy palmer, i think its down to the individals learning ability and how good the teacher is that theses short courses work i found them excelent and learned such alot, and they are at the other end off the phone if i need them they also do short hair courses you can choose as many days as you want just ring up balmain andy palmer its in essex she will advise you on there cutting courses good luck hunx ask for rose