Did it almost 3 years ago. I waited until I knew I was completely bald. I am no longer bald from the front & sides but remaining baldness visible from above, behind & thin hair visible when wet. Hard to sleep 1st 2 nights. Smiling hurt for about 6 months. Hairline at back of neck now too short (in my opinion) for a 2nd procedure to thicken treated area or cover remaining bald area.
I was a teacher and had it done 1st Monday of summer vacation. After Labor Day only one student (a freshman) and one teacher ever asked about it. But it looked awful at first and was definitely noticeable for most of the summer. Hard to see back there but my wife & I see no scar.