I don't think that it is TOO difficult, looking at Real OEM. Trying to INSTALL the rolling floor might be a bit more difficult if your X5 came without it. Due to the rollers on the lip of the trunk, there might be some bolt holes that remain uncovered once removed, but nothing some black silicone can't plug up! If I attack this and actually pull out the darn thing, it won't be for a week or two.