The climb up from the river on Seg 2 would be the hardest section. First 2-3 miles I think. That segment would definitely be easier riding backwards.
There isn’t anything like the climb up from Bear Creek on seg 1 on seg 3. There are some short technical sections that I have to walk but the climbs are fairly moderate and have good tread. I would rate the terrain on the low end of intermediate.
It would probably be a bit easier riding it backwards. If you have the time you can do it as a loop with some of dirt roads that run in the area as well.
Bill T