Last Friday I went to the rubber coated asphalt track, I train on, to practice some more barefoot running. I went 2.5 miles, which my longest barefoot run so far. I'm still getting blisters, but they don't seem to be as bad as my previous blisters, and they seem to be forming later in the run.
When I'm running barefoot, rough surfaces are not bothering me at all. Even when the blisters form, I don't feel much discomfort. I'm not sure if the blisters are caused because I'm picking rough surfaces to run on, or from not getting enough barefoot practice, or probably a little of both. I'll have to experiment a little to find out.
Article on Starting Barefoot Running
Everything You Need to Know to Become a Barefoot Runner