I just can't seem to get the hang of the knit stitch.

I can cast on well. Has anyone else who has learned to knit via a book or videos had this type of trouble? I watched the video on this website that shows how to do the knit stitch, and I understand what I am supposed to do--I just can't seem to do it. The problem I am having is slipping the stitch off the left needle onto the right needle. I grasped crocheting well when I learned those stitches--although it took a little to get the hang of it, but knitting is killing me. HELP