We get a lot of customers that order stock (ready made) units. Some are experienced hair wearers and some a newbies that just want to try out a unit. Here's a diagram that shows how to trim the base to size. You don't want to cut the front (shown at the bottom of the diagram) since the front hair line is graduated--cutting that would leave you with a 'wall of hair.' You only cut the back and sides.
Regards,
John
http://toplace.com/