We did this segment on our second day of backpacking and I would rate it as difficult. It was almost all uphill the first 6 miles, many narrow spots, many washed out spots, at some points you have water from the falls rushing down the path at you so it is very slippery, we had to crawl over 5 long jams that crossed the path, some on inclines where it was treacherous. While there are many falls to see, only the two at the end are close up; you only see lomolo from the top and there is another across the river. Bring lots of water as access to the river is not great for most of the way. The forest service map is incorrect on landmarks as we never saw the ones it listed and saw many that weren't on the map. The trail also splits at one point and that is not on the map (take the lower trail).
Regardless of all the unexpected obstacles this was easily the most beautiful portion of the hike with many different landscape and scenery changes. It also ends at the hot springs so you can give your feet a good soak :)