The Carpet on carpet rug pad was just what was needed to keep my area carpet from buckling on the wall to wall carpet.  I needed to trim it to size and my neighbor gave me an assist in positioning the pad exactly where I wanted the carpet to go. First we pulled off the clear cover sheet on one side of the pad,set it in place and then walked over it in stocking feet to help keep it positioned correctly.  We then peeled off the top cover sheet and positioned the carpet directly over the pad.  Once in place we walked all over the carpet to complete it's placement.  It has not moved since!