If it is already spliced then why not pull the splice apart and re-splice it? Lets see some pics of how it is done, there are just a few over-braided ropes out there that are used for winching. If you peel do want to knot it, it is very simple but requires you to be able to pull the knot tight, we use a tool that allows us to clamp the rope and pull on the knot using a table mounted winch.
-Alex