Well, this should be the same as the 172, if you follow the bonnet release cable from the handle in the left hand side footwell, youll get to a large gromet with a small hole (which takes the release cable), make a new hole through that and feed the wire through there, you should have enough room to work, but if not you may have to just take the expansion tank of the bulkhead to get you hands down to where the gromet is in the engine bay.
As Jonesy says pull the cable along the inside (Left is easiest) under all of the plastic trim, clip off/clip on, should be easy.
Good luck.