Get references...

This is what bad extensions look like.

Poor girl probably paid much too much for strand-by-stand THEN let someone just hack into it.
If I were her, I would not have paid and demanded immediate removal.

There really is a right way and a wrong way to cut extensions. This isn't one of those subjective things. Yes, a lot of styling is up to the individual but extensions MUST be cut in a certain manner.

This is why you should get references and take a look at a stylists' portfolio before you spend the money for high-dollar services like extensions (even sew-ins) and colour corrections. In this case, I can only hope that the cost of the hair was not a non-refundable deposit as it is in my salon.