There are lots of potential problem areas in all the stretches you mention unfortunately. Especially in a low water year and especially the stretch from CJ Dam to Swan Falls (its a little easier down closer to Swan Falls due to the reservoir). If you don't know that stretch, you can, and likely will sink your boat owing to some pretty serious rocks just underwater at this river level. At least that's what I'm told....
But, they are just about all doable if you know them well. The way to get to know them well is to float them and inspect them slowly. So that means hours and hours on the river learning the "path" through the rocks and sandbars.
The one piece of advice I would give you is to not assume that you will "see" all the rocks and relevant sandbars. Since many of the areas you mention cover fairly slow-moving water, a 2 inch deep sandbar will not necessarily be obvious because there is just not enough speed on the river to show a riffle and such. Same goes for large rocks just under the surface, there isn't enough current to make them swirl and appear like a large rock.
So, even if someone would tell you "watch out for this rock, or that sandbar", until you get on it and cruise it super slow, you will not know it.
And that's just doing it in broad daylight, doing it in pitch black is a whole nother story.
NOTE: Apparently, there was a rash of people out in the dark in various locations without any navigation lights on their boats last year and I heard a couple guys got tickets. Be sure to use your running lights for your boat in the dark.
Internet Scouting Pro Staff