We never really had to get out of the kayak, however the water was low enough that you could stop, fairly easily to plot the run you were going to take. I don't think there was really any "bad" runs, however, if your going by yourself or with a younger or less experienced kayaker, use good sense. The water moves pretty quick.
The shoals were scary at first, cause it sounds like a huge waterfall and you can't see the falls, until you right upon them. Most of the shoals are about two to three foot drops, straight forward. There are a couple areas where you can get out and just swim or take a break.
There are about 7 drops over the 150 to 200 yard run. After that, it's mostly sitting back and relaxing.
The take out is just past the first bridge you go under, on your left. they say there is a rope swing 150 yds before the bridge, but I didn't see it.
Take out is more of a challenge, due to the fact that you have to carry you kayak up a somewhat steep incline. Obviously my 10 year old and I made it, but it will make you break a sweat. To get to the take out, go south on Hwy 5, turn right on River Bend Spur. This will bring you to a "T" intersection, turn right on old hwy 5 / hwy 26, approximately 1/2 miles, turn left on 26. Go about 5 miles and you will cross the Cahaba River. Just past the bridge, there will be a dirt / grass parking area on your right. Park there and follow the dirt trail down to the river.