It was awkward compared to the front because you have to cut (I used a slitting disc on an angle grinder) through the double skinned part of the door. I haven't done the rears on this one yet but I did my old Disco. It didn't look pretty until the arches went on I must admit I'll grab a photo of the old one later so you can see but basically I just hacked it with the angle grinder then filled the gap in the door with expanding foam and then painted the foam with silicone sealer using a paintbrush to waterproof it.