Hi, Judy. The problem is that laminate ends to chip during the cutting and sometimes scratch. The scratching is easily handled with a few strips of masking tape on the tool or the part but the chipping is another matter. Bonded laminate can be cut pretty easily with the right saw blade and a router is even better. Really, the best way is to build all the substrate to exact size, then apply the laminate and trim it with a router. Next best, and not nearly as good is to apply the laminate and trim to exact size with a portable handsaw with a special carbide blade with about 6o teeth. Be sure to solidly mount/clamp a straight edge to guide the saw for this. If you need to lightly trim the back edge, you can scribe and use a belt sander, but a backsplash will hide a little mismatch with the wall.
The pre-laminated material is OK if you can get it in a size and pattern that fits your needs. The problem is that most people usually need some custom sizes or want to take advantage of the many colors and patterns that are available in laminate. Custom work always costs more than using off-the-shelf items.