The photo here shows just how difficult rock hopping can be but even here, as there wasn't too much of it on this particular trip, the trip was rated as level three. If you have never done any rock hopping and would like to get some idea of how well you might cope, try putting on a pack and stepping up onto and down off of a kitchen chair without using your hands. If this seems easy, you are not likely to have much trouble in the bush. If it seems impossible, you are likely to find it quite difficult at first.
Not sure how you would cope?
Try it. If you have never done any walking of this type before and you live near the coast, you should be able to find a rocky bit of coast line somewhere nearby. Walk along the rocks there. That should give you a good indication of how difficult you will find the trips.