How do I sew a patch on a Barbour jacket?

I have bought a Barbour repair kit for an Olive green Barbour coat and have cut out a patch. Do I cover the tear with the patch? Do I turn the edges of the patch under to stop fraying? (In which case I can't get the provided needle through all the layers) Do I sew through the lining as well as there is no way in unless I undo a seam. Please help. A diagram would be great but can't find one on the Web.