I don't know what a 9 minute pace is for you but I slowed down about 1.5- 2.0 minutes per mile when starting. So besides lowering the mileage as suggested, I felt the need to lower the pace. So if you normally run an 8 minute pace, 9 might be a good place to start.
No offense rbondi, but I totally disagree with your thoughts on this topic.
Pace is the last thing a new barefoot runner should be watching.
Concentrating on form, cadence and posture (yes, technically form, but kind of different) shoud be the priority.
Pace will come with time after learning how to run properly (barefoot, of course)... NATURALLY