its not too bad, just a bit fiddly, and ensure you get both shims in, one each side, or all shalt be for nought!
personally for the sake of another 20 odd quid i'd do the calbe too, and ensure the routing is correct, it should drop straight down out the pedal box assembly on the bay side, curve down and under the back of the steering column, behind the rack and through two clips on a flat metal bracket on the top middle of the subframe, then clip to a couple of clip on the inner passenger side chassis rail before curving round under the battery tray to the release fork bracket.