Hi i fitted a set of the real LR ones and it was easy to do. Does help if you have the right tools. Be carefull with cheap aftermarket ones. I would go for the Real LR ones, and to finish them off nicely get the front mudflaps too, and maybe the rear ones.
Part of the fitting is to place captive nuts in to the chassie rails. LR say that you can do this with a normal bolt and washer and nut. Helps if you have the right tool.