Personaly I feel that if you are not experienced enough to cut a piece you should have it done by a stylist. Not to put anyone down but it is a tricky cut to begin with. Any wig seller or piece stylist will do it properly. Try to be there when he does it so at least you could get a good look as to what is happening, this is only my humble opinion. It took my a good year to get comfortable with the piece to be able to do it myself. The best way to pratice is to do it on a piece that you are replacing with a new one. That way if you make a mistake it was intended to be discarded anyway. Good luck.